Chicago Class E forged steel turnbuckles feature a heat-treated hook on each end. Hook & hook turnbuckles are not as popular as jaw & eye variants because the hook fittings result in a lower Working Load Limit comparatively. But, they are convenient if connecting to a hoist ring, shackle or sling because often you need no other intermediate piece of rigging--the hook simply slips over your termination point. They meet the performance requirements of ASTM Specification F1145-92, Type 1, Grade 1 (supersedes FF-T-791B). They are hot galvanized and offer a 5:1 safety factor.