Size 23mm,27mm, Length 42mm and 46mm standard CrMo impact socket, air socket material CrMo steel,meet Din & Ansi,w/ISO9001 2000 Primo Impact Sockets·All Impact sockets are made from high strength CR-MO alloy steel. ·Special heat treatment for the best combination of strength and impact resistance.·Optimum wall thickness design for strength and access on fasteners having restrictions·All dimension ...