Forged Alloy Steel - Quenched and Tempered. 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 Crosby. Suitable for use with Grade 100 and Grade 80 chain. Fatigue rated at 1-1/2 times the Working Load Limit at 20,000 cycles. Look for the Platinum Color - Crosby Grade 100 Alloy Products. Hook can be tip loaded at the reduced Working Load Limit, see below. Operator must ensure the load is retained properly in the hook.