Royal Wire's double wire hooks are made out of 5/16" diameter carbon steel wire and then zinc plated to guard against rust and corrosion. The Cement Block hooks fit over a standard cement block. Recommended usage to hang: Bridles, Halters, Lead Ropes, Lunge Lines, Coats...anything you can come up with! This hook does double duty as a portable garden hose rack, just flip it upside-down onto a standard "2x4" and use the wide hook side to hang the hose. This hook is 15" long. Hooks are now sold individually.