Indusco Swivel Self-Locking Hook is a painted grade 80 drop forged steel swivel hook. A falling load may cause serious injury or death. Loads may disengage from the latch hook if proper procedures are not followed. Hook must always support the load. The load must never be supported by the latch. Never apply more force than the hooks assigned working load limit (WLL) rating. Never lift with the tip of these removable hooks. 1/2-inches chain size. 12000 pounds working load limit. Working load limit of this steel hook is based on a design factor of 4:1.