Yescom 60PCS Level Protector Sleeves act as a crucial barrier between dissimilar metals, preventing moisture intrusion and minimizing the risk of electrolysis Crafted from rugged rubber, feature resistance to UV rays, corrosion, and weathering Fit 1/8', 5/32', and 3/16' cable railing posts, with a length of 13/32' and a flange diameter of 21/32' Easy to install and replace, suitable for indoor and outdoor deck/porch cable railing system 60pcs grommets provide ample coverage for cable railing project