ALLOY MECHANICAL COUPLING LINK Used as a top fitting to attach chain legs to master link. Often used as a bottom fitting to attached plate clamp, engineered device, or shackle to chain sling leg. Wide Body (B dimension) for extra room. Heavy duty galvanized retaining collar houses square stainless steel locking spring. Center pin has recess for strong mechanical lock. Full traceability Proof tested to 2 times working load limit.