Forged alloy steel, quenched and tempered. Innovative cradle design allows for 100% efficiency of grade 100 chain. Individually proof tested to 2-1/2 times the working load limit with certification. Each hook has a product identification code (PIC) for material traceability, along with the size and the name and USA in raised letters. Suitable for use with grade 100 and 80 chain. The use of cradle grab hook will allow 100% of the chain sling capacity. When used to hook back to chain leg to form a choker, the angle of the choke must be 120° or greater. When used as a chain shortener, minimize twist of chain and ensure chain is fully engaged in hook. Fatigue rated at 1-1/2 times the working load limit at 20000 cycles.