●End Caps are designed to prevent your support poles from slipping while also preventing damage to the deck of a boat. End caps are sized for use with 2" x 4" wooden boards. ●End Caps and Bottom Caps will make the job of creating a structure for your shrink wrap much easier while eliminating common concerns related to support posts. ●The flexible, plastic design of End Caps provide much better weight distribution than the old-fashioned method of stapling carpet squares to a 2x4. ●End Caps are used to provide a smooth surface on the top of 2" x 4" support posts. You no longer need to worry about sharp corners of a 2x4 or staples tearing your shrink wrap. ●End Caps have no foam pads which makes their surface more smooth and allows shrink wrap to slide over the end cap easily.