Shop our Chain Link Loop Caps that are available in both pressed steel and cast aluminum. We carry loop caps for round post sizes of 1-5/8", 2", 2-1/2", 3", 3-1/2", and 4" which will accept round top rail of 1-3/8" and 1-5/8". We have loop caps in silver (galvanized & aluminum), black, brown, and green! Chain Link Loop Caps are used to install the top rail on the line posts.