Unlike Crosby A-1338 Clevis Grab Hooks, these hooks do not attach directly to the chain itself. They are usually attached using a Crosby A-1337 Lok-A-Loy 10 Connecting Link, or perhaps a shackle. They are suitable for use with Grade 100 and Grade 80 chain. Made from forged alloy steel, Quenched and Tempered, load-rated and individually proof-tested to 2-1/2 times the Working Load Limit with certification. Safety factor of 4:1.