I ntended for semi-permanent installations, Bar-Loc Chain Connectors accept any chain and the largest typical cage bars, but are impossible for primates to remove once properly installed. Made out of large guage stainless steel, Bar-Locs will handle the roughest use. Easily installed with a 7/16 inch wrench, Bar-Locs can be re-used so cage swaps are possible, as required. Less expensive than Quick-Links and accommodating large diameter cage bars, there is no other chain connector that can compete with BEM's new Bar-Loc for versatility and security.