Best Rear Slotted Shims in 2026

The cold, precise weight of these 300 series stainless steel shims immediately signals that this isn't a budget hobbyist set. When you're working on high-tolerance machinery, having a reliable way to bridge microscopic gaps is non-negotiable, and this Size A assortment delivers exactly that. The 2" x 2" dimensions and 5/8" slots make them incredibly versatile for shop environments, while the eight distinct thickness increments allow for granular adjustments. I particularly like that the kit arrives in a sturdy chipboard box, which keeps the 80 pieces organized rather than letting them become a chaotic mess in a drawer. Whether you need a razor-thin 0.001" layer or a thicker 0.075" shim, the corrosion resistance ensures these will stay functional even in less-than-ideal shop conditions.

Precision engineering demands exact tolerances that makeshift shims or cardboard scraps simply cannot provide. This 130-piece assortment from Small Parts is a serious upgrade for any machine shop or fabrication setup requiring absolute accuracy. Each 2" x 2" shim is crafted from 300 series stainless steel, ensuring they won't succumb to rust or corrosion even in harsh environments. The variety is impressive, offering ten pieces each across thirteen specific thicknesses ranging from a razor-thin 0.001" all the way up to 0.125". I particularly like the 5/8" slot design, which allows for easy positioning during fine adjustments. Everything arrives organized in a durable metal box, making it easy to keep these critical components protected and accessible on a busy workbench.

How much time do you waste hunting for that one specific thickness when a precision alignment task is on the line? This Small Parts assortment solves that frustration by providing a massive 130-piece collection of 4" x 4" shims in a single, organized kit. I found the variety of thicknesses—ranging from a razor-thin 0.001" all the way up to 0.125"—to be incredibly comprehensive for high-stakes BISS applications. Because they are crafted from 300 series stainless steel, you don't have to worry about rust or corrosion compromising your tolerances over time. The 1-1/4" slots make them easy to manipulate, and the durable metal box ensures the entire set stays protected in a professional workshop environment.

Precision alignment in heavy machinery often fails when you lack the exact fractional thickness needed to level a component. This Small Parts Size C kit solves that headache by providing a massive 80-piece assortment of 4" x 4" slotted shims. I found the variety of thicknesses particularly impressive, ranging from a paper-thin 0.001" all the way up to 0.075". Because they are crafted from 300 series stainless steel, you don't have to worry about rust or corrosion compromising your tolerances over time. The 1-1/4" slots make them easy to slide into place, and the sturdy chipboard box keeps the entire set organized and accessible in a busy shop environment.

Precision leveling requires the right scale of hardware, and this Maudlin Products Size D slotted shim set delivers exactly that for heavy-duty BISS applications. After putting this 130-piece box to the test, it is clear that the 5-inch by 5-inch dimensions are specifically engineered for larger-scale structural adjustments where smaller shims simply lack the surface area to be effective. The sheer volume of pieces in this kit means you won't be scrambling mid-project when a fine adjustment is needed. It is a professional-grade solution that prioritizes stability and consistent spacing, making it a reliable staple for anyone working in precision leveling or industrial installation environments.

Maudlin Products has established a gold standard for precision leveling with this Size B slotted shim shop kit. Any professional machinist or shop manager dealing with intricate setups knows that a disorganized shim collection is a recipe for downtime. This 80-piece box provides a substantial volume of 3-inch by 3-inch shims, ensuring you aren't constantly hunting for the right thickness mid-setup. The slotted design is a thoughtful touch for stability, making these an essential component of a high-end BISS toolset. While the initial investment is significant, the sheer quantity and specific sizing included in this kit make it a reliable cornerstone for maintaining accuracy in a demanding workshop environment.

Why settle for mediocre stopping power when a complete overhaul is within reach? This R1 Concepts eLine Series kit is a total game-changer for 2012-2016 Subaru Impreza owners looking for a seamless replacement. You get everything in one box: four high-performance G3000 cast iron rotors and eight low-dust ceramic pads. The precision-drilled holes and diamond slotted design aren't just for show. They actively dissipate heat and prevent cracking while acting as a handy wear indicator. I love that the zinc finish offers serious rust protection right out of the box. Between the noise-eliminating shims and the asbestos-free ceramic formula, you get a much quieter, smoother ride without that annoying black dust coating your wheels.

Most drivers assume that upgrading to drilled and slotted rotors is strictly for racing enthusiasts, but for a heavy Jeep Grand Cherokee, it is actually a practical move for heat management. This AutoShack kit provides a complete front-end overhaul, pairing two black e-coated rotors with four ceramic pads. The drilling helps dissipate heat while the slots prevent debris buildup, which is vital if you are running 4WD or AWD. I particularly like that the rotors feature a black coating to fight off the rust and corrosion that typically plagues older brake components. Because these use ceramic pads and include noise-reducing shims, you can expect much cleaner wheels and quieter stops compared to standard metallic setups. It is a direct-fit solution that restores original stopping power without the mess.

Muscle car enthusiasts building high-performance A-Body or F-Body street machines absolutely require this Wilwood Superlite kit to bridge the gap between massive stopping power and functional parking brake reliability. This isn't just a cosmetic upgrade. It is a complete performance overhaul featuring 12.88-inch drilled and slotted two-piece rotors paired with striking red 4-piston calipers. I love how the internal shoe system remains neatly hidden, providing serious static holding power without cluttering the aesthetic of your rear end. The BP-10 Smart Compound pads ensure your rear braking perfectly complements upgraded fronts for a balanced feel. Just keep in mind that you will need at least 17-inch wheels to clear these massive assemblies, but for a serious custom build, the 67-pound kit delivers everything necessary for a professional-grade installation.