These latch kits are to be used on Crosby Grade 100 Shur-Loc hooks, including models S-1316A, S-1317A, S-1318A, S-1326A and S-13326A (reference images at right). Shur-Loc hooks operate with a "trigger" style release on the back side of the hook, which is where these replacement latch kits are installed. Each latch kit ships unassembled and individually packaged with instructions.