✔️ The 3 5/8" fits standard 4x4" Posts, and has a nail-in-place installation style that enhances the stability and lengthens the lifespan of this high-quality, fence post cap ✔️ It features a black polypropylene construction that is both weather and UV resistant, for long-lasting color and performance. Great, in high winds, rain, snow and sun ✔️ Designed and manufactured the USA by the leading manufacturer in the post cap industry with high quality materials ✔️ This easy to install post cap sleeves over the top of the post, fits externally and requires only one screw for installation. Installation nails/ screws are NOT included with this purchase. Pack sizes comes in either 32 or 54 ✔️ All of our post caps are made to fit posts of their respective size. For example, a 3-5/8" post cap will fit a 3-5/8" post (outside diameter), a 4" post cap will fit a 4" post (outside diameter), and so forth Whether you are building a new deck, fence, dock, or mailbox, this pack of 54 black polypropylene post caps will be the perfect addition to set your new outdoor project apart. The posts are created to fit 4x4" pressure treated wood posts and come with a pre-cut nail hole to make installation a breeze. These posts will not only make your new deck or fence look amazing, but will also withstand the elements for years to come. Made in the USA. FEATURES: - Fits 4x4" wood posts - Pre-cut nail hole for easy installation - Color: Black - Material: Polypropylene -Pack size: 54 caps -Made in the USA