[Fit for wood post size] Designed to specifically fit on a 4 x 4(actual 3.5x3.5 Inch) nominal wood post, The Interior diameter of the PP plastic post cap is 3.58x3.58 Inch (Please measure your fence size correctly first). [Easy & Quick Assembly] There are 6 pillar caps in the package, each with 2 screws, just put the post cap on the nominal wood post, and then screw the two screws into the wood post through the small holes on both sides of the post cap,it's easy and convenient. [Post Caps of Sturdy Construction] This matte black post cap cover is made of high-quality premium PP plastic material, Featuring but hard, rust prevention, waterproof and heat- characteristics. [Decorate Outdoor Fence] Enhanced Aesthetics Wood Fence Post Caps, Its sleek and stylish design complements any fence or deck, giving a finished and polished look to your fence and yard. [Best Protection] wood fence post cap is specially designed to protect your wooden posts from water and sun damage. besides, It can prevent bird claws from scratching the fence. Color:Black Material:PP Package Contents: 6 * Fence Post Caps Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.