New style incorporates throatopening equal to or larger than old style hooks.Each product has a Product Identification Code (PIC) for materialtraceability along with a Working Load Limit, and the name Crosby or "CG"forged into it.All hooks incorporate Crosbys patented QUICK-CHECK marks to help in determining if throat opening dimension has changed.Each hook can be equipped with a Crosby S-4320 heavy duty stampedlatch with the high cycle, long life spring.Forged Alloy Steel Quenched and Tempered.Design Factor of 5 to 1