Suitable for use with both Grade 80 and Grade 100 chain. Individually Proof Tested at 2-1/2 times Working Load Limit with certification. Locking system that provides for simple assembly and disassembly - no special tools needed. 25% stronger than Grade 80. Meets ASTM A-952 standards for Grade 100 chain fittings. Forged Alloy Steel - Quenched and Tempered. Sizes 9/32 through 1 inch are fatique rated. "Look for the Platinum Color-Crosby Grade 100 Alloy Products."