Designed to connect Grade 100 chain fittings produced with Engineered Flat to Grade 100 chain. Forged Alloy Steel - Quenched and Tempered. Suitable for use with Grade 100 and Grade 80 chain. Individually Proof Tested to 2-1/2 times the Working Load Limit with certification. Locking system that provides for simple assembly and disassembly no special tools required. 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.