These specialty hooks are rated for Grade 100 chain in choker applications, and are to be used with S-1325A Couplers. Each hook is individually proof-tested to 2-1/2 times the Working Load Limit with certification, and equipped with a Product Identification Code (PIC) for material traceability, along with the size and the name Crosby & U.S.A. in raised letters. Fatigue rated at 1-1/2 times the Working Load Limit at 20,000 cycles, Quenched and Tempered, load-rated. Made from Grade 100 alloy steel, featuring Crosby's "Platinum" coloring. Suitable for use with Grade 100 and Grade 80 alloy chain slings. Safety factor of 4:1.