Best Cmt Long Length Drill Bits in 2026

Speed helix design for three times faster drilling than standard bits

Last 50 percent longer than high-speed steel

Easier drilling, reduced heat and extended drill bit life

Speed helix design for three times faster drilling than standard bits

Last 50 percent longer than high-speed steel

Easier drilling, reduced heat and extended drill bit life

Premium M42 8% Cobalt Steel ,68-70 HRC (Rockwell Hardness Scale) ,Usually Give the Best Heat,Wear and Chip Resistance and Long Tool Life.

3 Steps Desigh for Cutting through Stainless Steel,Hard Metals,Aluminum,Plastic.

This Cobalt Drill Bit is Typically Capable of Running Three to Five Times Faster.Despite the Higher Price,the Cost Per Hole When Using Cobalt Drill Bit Will be the Lowest,Since It Can Produce So Many More Holes.

Bright finish: Classic M2 High Speed Steel construction with Bright Finish for proven capability and durability.

Strength & Hardness: Made with HSS M2 steel, Rock wall Hardness Level HRC 62-63.

Package & Size: 12 Pieces in a plastic bag, Diameter 5/16 inch, Total length 4 inch, Working length 2-3/4 inch.

Diameter: 2mm(0.08in) 2.5mm(0.09in) 3mm(0.12in) 4mm(0.16in) 4.5mm(0.18in) 5mm(0.2in) 6mm(0.24in) 7mm(0.28in).Length:about 200mm(about 7.8 inch)

Application:drill bits kit are great for most drilling jobs and materials such as aluminum, wood, plastics PVC and other different materials or your daily drill use.

Quantity:This set includes 8 pieces drill bit in different sizes of the most popular drill bits.1 pc/per size.

✔️【 COBALT DRILL BIT DIMENSION】:1/8"(Diameter) x 1-5/8"( Flute Length) x 12"(Overall Length)

✔️【 COBALT MATERIAL】: HSS(M35) Cobalt Steel is the premium material with high hardness and red hardness to enable long drilling life and fast drilling performance.

✔️【 SURFACE TREATMENT】: The Gold Oxide Ember finished surface treatment strongthen the hardness of drill bit body  to ensure the long drilling life and better drilling performance.

High Quailty Material: Manufactured from Industry grade M35 High Speed Steel with 5% Cobalt added, usually giving better Heat, Wear and Chip Resistance and Long Tool Life.

135° Split Point: The 135° fast cutting point is automatically centered and prevents walking, clears chips and particles faster. Making drilling precise, reducing friction and heat for a smooth chip movement.

Professional Drill Bits: gold oxide finish and round straight shanks， fully ground spiral groove design with high grinding accuracy, for cutting stainless steel, steel and cast iron as well as wood, aluminum alloys and other metals.

WIDELY USED: The drill bit kit is very suitable for most drilling operations and aluminum, wood, plastic and other materials or your daily use of drill bits.

HIGH SPEED STEEL: These drill bits are made of high speed steel, which has higher hardness and durability, and is more wear-resistant and durable than other metal materials.

EXTRA-LONG LENGTH: The length of the drill bit is about 200mm (about 7.874 inches), which has better stability and balance during fast operation to ensure a complete position.

EXTRA LONG LENGTH & 2 TYPE SHANK: Extra long 300mm body provides better stability and balance during quick operation to ensure position is intact. Flute length is 180mm with ROUND shank and REDUCED shank.

HIGH QUALITY MATERIAL: Classic Carbon Steel Material for fast cutting against tough wood material. High hardness, offer superior cutting power and durable.

FULL SET OF STANDARD SIZE: With the drill bits we offered, you can process 7 different diameter holes, ( Round shank| 1/8'', 3/16'', 1/4'', 5/16'', 3/8'' Reduced Shank| 7/16'', 1/2'' ), which meet your different needs perfectly.

Specification: Shank Type: Round Shank; Tool Flute Type: Spiral; Twist Drill Bits Diameter: 0.5mm-2.3mm; Shank Diameter: 2.35mm / 0.09-inch; Total Length: 45mm

Material: Made of high-speed steel, with high hardness and stable operation. The drill bit is titanium coated, which has higher wear resistance and lower friction coefficient. Not easy to accumulate chips and long service life.

Cooling: Adapt to several kinds of cooling conditions, for example oil mist, water, oil, air cooling.

【extral long length】Bits are 150mm~160mm(about 5.9~6.3 inchlong, provides better stability and balance during quick operation to ensure position is intact.

【long cutting edge】The extra long cutting edge(88-100mm) allows you using these bits to drill deep holesshape tips can make the drilling easier and more effortless.

【5 sizes】This extra long twist drill bits set has 5pcs in 2mm, 3mm, 3.5mm, 4mm, 5mmOD.

✔️【DRILL BIT DIMENSION】:1/8"(Diameter) x 1-5/8"( Flute Length) x 2-3/4"(Overall Length)

✔️ 【COBALT MATERIAL】: HSS(M35) Cobalt Steel Enable Long Drilling Life and Fast Drilling Performance

✔️ 【SURFACE TREATMENT】: Gold Oxided Ember Finished Treatment Keeps High Hardness of Body Shank

Material: Constructed of M2 HSS with strict heat-treatment to enable high hardness and tensile to keep long cutting life to drill vary wood material.

Tip Design: The 135-degree standard tip design not only promises strong sharpness, but also prevents slippage and makes drilling stable and precise. Smaller bits like this are much more rigid, and will not flex like long Bits.

5pcs Short Bit Set Sizes: 3/32, 1/8, 3/16, 1/4, 5/16-inch which meet your different drilling requirement. total length: 2.36”/60mm. Easy to use light, compact and durable.

Black gold high speed steel is the long lasting material when it comes to common drill bit materials, not only will the bit's structural integrity withstand tremendous heat and wear, but more importantly black gold bits can drill through tougher materials than common HSS bits.

With a 135 degree split-point, these drill bits will catch on the work-surface with greater ease and not wander all over the surface making scratch-marks. This means that after securing the bit in the machine all that is needed is a steady hand to point and apply pressure, and that's it.

The straight round shank of our bits means you can use this drill bit with nearly all types of machines.

Specification: Drill Bit Diameter: 1mm / 0.04-inch, Flute Length: 50mm / 1.97-inch, Shank Diameter: 1mm / 0.04-inch, Total Length: 80mm / 3.15-inch; 10 x Mini Drill Bits

High Speed Steel: Made of high-speed steel, with high hardness, heat resistance, wear resistance, durability and long service life.

Extended Drill：The jobber extended drill is suitable for a wide range of applications, allowing you to access hard-to-reach areas where ordinary drills cannot. High hardness, sharp twist drill bits will make drilling easier and more efficient.

[Specifications]- Twist Drill Bits Diameter: 2.5mm / 0.1-inch; Drill Bit Length:100mm / 3.94-inch; Shank Diameter: 2.5mm / 0.1-inch; Total Length: 160mm / 6.3-inch; 2 x Straight Shank Twist Drill Bit

[Strength and Hardness]- Made of high-speed steel. HSS(High Speed Steel) enables the drill body harder and can keep a longer drilling life.

[Twisted Design]- With the twisted design, it can improve cutting accuracy by centering the tip. It can avoid displacement of the drill bit during work, and at the same time remove debris and particles faster and easier.

【Size & Package】Shank diameter: 2mm / 0.08" (approx.); Drill bit diameter: 2mm / 0.08" (approx.); Overall Length: 160mm / 6.3" (approx.); Package includes 2pcs 2mm straight shank drill bit.

【High Speed Steel】Made of HSS material, the extra long drill bit is hard enough, anti-bending and will not fracture easily. The surface coating can better protect the drill bit sets from corrosion and expand their longlife.

【Straight Shank】The round and straight shank is suitable for a wide variety of toolholding systems. Universal flute and overall length allow minimal adjustment during work.

【High Quality】M35 Cobalt alloy steel drill bit for improved performance, extra durability and long lifetime. Fully grounded for easy particle removal, decrease friction, and precise drilling

【Stubby Sizes】Drill bits measure only 2.36-inch in overall length with 1-inch cutting flute, allowing access to hard-to-reach and tight spaces

【Efficient Design】135° split point two-blades special design drill tip (1/8-inch and larger) for perfect self-centering and fast drilling

Specification: Drill Bit Diameter: 2mm / 0.08-inch, Flute Length: 60mm / 2.36-inch, Shank Diameter: 2mm / 0.08-inch, Total Length: 100mm / 3.94-inch; 5 x Mini Drill Bits

High Speed Steel: Made of high-speed steel, with high hardness, heat resistance, wear resistance, durability and long service life.

Extended Drill：The jobber extended drill is suitable for a wide range of applications, allowing you to access hard-to-reach areas where ordinary drills cannot. High hardness, sharp twist drill bits will make drilling easier and more efficient.

[High Speed Spiral Design]: This twist drill bits adopts a high speed spiral design, the drilling speed is significantly faster than standard drill bits, and the flutes help reduce friction and heat

[Make Drilling More Labor Saving]: The cutting edge of this spiral drill bit is hardened and polished to achieve the purpose of sharpness, the longer size allows you to drill more labor saving

[5 Popular Sizes]: This HSS drill bit set includes 5 most popular drill bits with diameters of 2mm, 3mm, 3.5mm, 4mm, 5mm, and lengths of 150mm to 160mm

Twist drill bits are made from high-speed steel for high hardness and durability

This set includes 8 pieces drill bit in different sizes of the most popular drill bits

Extra long cutting edge allows you using these bits to drill deep holes

[Key Parameters]: Shank Dia: 3mm/0.12"; Cutting Edge Dia: 3mm/0.12"; Cutting Edge Length: About 33mm/1.3"; Total Length: 61mm/2.4";

[Product Features]: Made of high-quality 5% cobalt element high-speed steel, five-axis composite machine integrated grinding manufacturing, high dimensional accuracy, after quenching and tempering treatment, the surface is gold-plated titanium treatment, wear-resistant, not easy to stick to the knife, and smooth chip removal"," High strength, good endurance and long service life;

[Scene]: Mainly used for machine power tools, electric drills, drill presses and other equipment main applicable accessories, can be drilled in metal products and non-metal products, steel, stainless steel, copper, aluminum, wood, plastic and other materials, through The effect of hole or counterbore is good;

DURABLE QUALITY: Twist drill bits are made from high-speed steel for high hardness and durability

PROFESSIONAL DIY USE: Increases cutting speed with self-centering and prevents walking, clears chips and particles faster. They are great for most drilling jobs and materials such as aluminum, wood, plastics

DIFFERENT: Extra-long length drill bit reaches farther and drills deeper than a jobber or long length drill bit. Extra long cutting edge allows you using these bits to drill deep holes

❤Premium Material: Twist drill bits are made from high-speed steel. High speed steel have a high hardness for fast, smooth cutting of plywood, hard wood and soft wood, swift bore. Comes in a sturdy case with a comfortable grip handle, precision ground for clean cuts and easier fastening.

❤Package: It includes 5 sizes in one drill bit set (2mm,3mm,3.5mm,4mm,5mm), which meet your different needs perfectly. This set includes 5 pieces drill bit in different sizes of the most popular drill bits.

❤Good Performance: Extra long cutting edge allows you using these bits to drill deep holes. Sharp twisted drill bits will make the drilling easier and more effortless. They are great for most drilling jobs and materials such as aluminum, wood, plastics.

【Twist Drill Bit Set】Come with 8 pieces drill bit in different sizes of the most popular drill bits, can meet your varied requirements! 8 sizes: 4, 4.2, 4.5, 5, 5.2, 6, 8, 10mm OD.

【HSS Twist Bits】Twist drill bits are made from High-speed Steel for high hardness and durability, not easy to bend. Sturdy and longer life!

【Extra Long Bit】Extra long cutting edge great for general purpose use on hand drills and allows you using these bits to drill deep holes. Length: 200mm (about 7.9'')

Specification: Drill Bit Diameter: 1mm / 0.04-inch, Flute Length: 70mm / 2.76-inch, Shank Diameter: 1mm / 0.04-inch, Total Length: 120mm / 4.72-inch; 20 x Mini Drill Bits

High Speed Steel: Made of high-speed steel, with high hardness, heat resistance, wear resistance, durability and long service life.

Extended Drill：The jobber extended drill is suitable for a wide range of applications, allowing you to access hard-to-reach areas where ordinary drills cannot. High hardness, sharp twist drill bits will make drilling easier and more efficient.

HSS MATERIAL: The drill bit set uses high speed steel material, this material is durable, strong and practical, with a long service life, heat and abrasion resistance.

TWIST DESIGN: Fully ground spiral groove design clears particles quickly, decreases friction and heat for a faster and cooler drilling performance. They can clear chips and particles more quickly and easily.

EXTRA LONG: The extra long cutting edge allows you to use these bits to drill deep holes. Twisted drill bits will make the drilling easier and more effortless.

Extra-length, for deeper holes than Jobber length

130-degree point angle, for centering and to reduce pressure on cutting edges

High-speed steel (HSS) containing cobalt is a combination of toughness and hardness, for use on drilling into hard substances

Drill Bits: Cutting edge diameter: 2.8mm / 0.11"; cutting edge length: 55mm / 2.17"; shank diameter: 2.8mm / 0.11"; overall length: 100mm / 3.94"; cutting hardness (max.): HRC55. Sharp cutting edge provides smooth cutting and no glitches.

Wide Applications: Suitable for drilling materials below HRC55, such as stainless steel, alloy steel, tool steel, carbon steel, aluminum alloy, etc.. Used on machining centers, drilling machines, CNC lathes, CNC engraving and milling machines.

Carbide Material: Made of super fine grain carbide, it has high hardness (HRC92-94), wear resistance, heat resistance, and high bending strength. With good milling and cutting performance, carbide can run at higher speed than high-speed steel.

【Parameter】- Material:HSS-6542;Hardened to:65-66Hrc;Cutting Diameter:32mm/1.26inch;Total Length:150mm/5.91inch

【Material】- High speed steel 6542 is designed to ensure sharp and fast execution in metal surface for clean results;32mm cutting diameter. Good for most general purpose applications, featuring a combination of hardness and toughness for wear resistance

【Advantage】-Expanding the size range capacity of a portable drill chuck; Common flute and overall length for minimal adjustment during tool changes