Accuform Bumper Post Sleeve for 4" to 4-1/2" Dia Post, 52" H x 1/4" Thick. Cover up and improve the appearance of existing bumper posts and bollards in and around plants, facilities, docks, parking lots, drives, and pathways. Shield away unsightly old posts that are rough from chipping, pitting, and peeled paint. For the right post fit just measure the post?s circumference or diameter and height. Sleeve can be easily cut to length. To install, either simply slide the sleeve over the post, or for a secure fit, apply an adhesive foam tape to the top and base of the post, then twist while sliding the sleeve down over the post for a snug fit.