Best 4 Decking Caps in 2026

4x4 (3-5/8" x 3-5/8") Plastic Black Fence Post Caps - 16 Pack

Cap presses over the outside of a 4x4 (3-5/8" x 3-5/8") Post, a little flex, but will Not Stretch. Must be secured with nails or an adhesive that bonds to plastic and wood, should be pre-drilled if securing with nails

Inside Dimension 3-5/8" x 3-5/8" Square, 1/8-inch-thick to protect your treated posts from water and sun damage

4x6 (3-5/8" x 5-5/8")Plastic Black Fence Post Caps

Multipack Quantity Item - Please verify correct quantity needed

Cap presses over the outside of a 4x6 Post, a little flex, but will Not Stretch.

4x4 (3-5/8" x 3-5/8") Plastic Black Fence Post Caps ~ Multi-pack Quantity Item - Please verify correct quantity needed

Size: Inside Dimension 3-5/8" x 3-5/8" Square ~ 1/8-inch-thick to protect your treated posts from water and sun damage

Installation: Must be secured with nails or an adhesive that bonds to plastic and wood, should be pre-drilled if securing with nails. Cap presses over the outside of a 4x4 Post, a little flex but will not stretch. Can be painted, must use a paint that adheres to plastic

4x4 (3-5/8" x 3-5/8") Plastic Black Fence Post Caps

Multipack Quantity Item - Please verify correct quantity needed

Must be secured with nails or an adhesive that bonds to plastic and wood, should be pre-drilled if securing with nails. Cap presses over the outside of a 4x4 (3-5/8" x 3-5/8") Post, a little flex but will not stretch. Can be painted, must use a paint that adheres to plastic.

4x4 (3-5/8" x 3-5/8") Plastic Black Fence Post Caps

Multipack Quantity Item - Please verify correct quantity needed

Must be secured with nails or an adhesive that bonds to plastic and wood, should be pre-drilled if securing with nails. Cap presses over the outside of a 4x4 Post, a little flex but will not stretch. Can be painted, must use a paint that adheres to plastic.

4x4 (3-5/8" x 3-5/8") Plastic Black Fence Post Caps ~ Multi-pack Quantity Item - Please verify correct quantity needed

Size: Inside Dimension 3-5/8" x 3-5/8" Square ~ 1/8-inch-thick to protect your treated posts from water and sun damage

Installation: Must be secured with nails or an adhesive that bonds to plastic and wood, should be pre-drilled if securing with nails. Cap presses over the outside of a 4x4 Post, a little flex but will not stretch. Can be painted, must use a paint that adheres to plastic

6x6 (5-5/8" x 5-5/8") Plastic Black Fence Post Caps - Multipack Quantity Item - Please verify correct quantity needed

Please take time to measure your post not all 6x6 post are the same dimension. These caps are made for Nominal 6X6 fence post that measure 5-5/8"x 5-5/8"

Cap presses over the outside of a 6x6 (5-5/8" x 5-5/8") Post, a little flex, but will Not Stretch

6x6 (5-5/8" x 5-5/8") Plastic Black Fence Post Caps - Multipack Quantity Item - Please verify correct quantity needed

Please take time to measure your post not all 6x6 posts are the same dimension. These caps are made for Nominal 6X6 fence post that measure 5-5/8"x 5-5/8"

Cap presses over the outside of a 6x6 Post, a little flex, but will Not Stretch

4x4 (3-5/8" x 3-5/8") Plastic Black Fence Post Caps ~ Quantity: 32 fence caps

Size: Inside Dimension 3-5/8" x 3-5/8" Square ~ 1/8-inch-thick to protect your treated posts from water and sun damage

Installation: Must be secured with nails or an adhesive that bonds to plastic and wood, should be pre-drilled if securing with nails. Cap presses over the outside of a 4x4 Post, a little flex but will not stretch. Can be painted, must use a paint that adheres to plastic

Plastic Black 4x4 (3-5/8"x 3-5/8") Nail Hole Fence Post Caps

Easy Installation - Must be secured with nails (nails are NOT INCLUDED) ~ Pre-cut with 1/8” diameter Nail hole – recommend using a Ring Shank 6D or larger nail or 11 gauge nail (2 inches or longer)

Cap presses over the outside of a nominal 4x4 post (nominal posts measure 3-1/2”x3-1/2”) ~ A little flex, but will NOT STRETCH ~ 2mm-thick to protect your pressure treated posts from water and sun damage

Plastic Black 4x4 (3-5/8"x 3-5/8") Nail Hole Fence Post Caps

Easy Installation - Must be secured with nails (nails are NOT INCLUDED) ~ Pre-cut with 1/8” diameter Nail hole – recommend using a Ring Shank 6D or larger nail or 11 gauge nail (2 inches or longer)

Cap presses over the outside of a nominal 4x4 post (nominal posts measure 3-1/2”x3-1/2”) ~ A little flex, but will NOT STRETCH ~ 2mm-thick to protect your pressure treated posts from water and sun damage

Plastic White Fence Post Caps 4x6 (3-5/8" x 5-5/8")

Decorative Cap Presses over the outside of a 4X6 (3-5/8" x 5-5/8") Fence Post, a little flex, but will Not Stretch.

Can be secured with nails or glue, should be pre-drilled if securing with nails. Can be painted, must use a paint that adheres to plastic.

Plastic White Fence Post Caps 4x6 (3-5/8" x 5-5/8")

Decorative Cap Presses over the outside of a 4X6 (3-5/8" x 5-5/8") Fence Post, a little flex, but will Not Stretch.

Can be secured with nails or glue, should be pre-drilled if securing with nails. Can be painted, must use a paint that adheres to plastic.

Plastic 6x6 (155mm x 155mm) Fence Post Caps

Easy Installation - Must be secured with nails or screws (nails or screws are NOT INCLUDED) ~ Pre-drilled with 1/4” diameter hole in the side of cap – recommend using #8 or #10 stainless steel screws

1/8-inch-thick to protect your pressure treated posts from water and sun damage ~ Very Durable and contains UV inhibitors to protect against the elements

Plastic 6x6 (155mm x 155mm) Fence Post Caps

Easy Installation - Must be secured with nails or screws (nails or screws are NOT INCLUDED) ~ Pre-drilled with 1/4” diameter hole in the side of cap – recommend using #8 or #10 stainless steel screws

1/8-inch-thick to protect your pressure treated posts from water and sun damage ~ Very Durable and contains UV inhibitors to protect against the elements

Plastic White Fence Post Caps 6x6 (5-5/8" x 5-5/8") ~ Multi Pack ~ Made in USA!

Cap presses over the outside of a 6x6 (5-5/8" x 5-5/8") Post, a little flex, but will Not Stretch

Can be secured with nails or glue, should be pre-drilled if securing with nails. Can be painted, must use a paint that adheres to plastic.