Socket, Socket Size 5/16 in, 12-Point, Alloy Steel, Chrome, Deep, Hand, Drive Size 3/8 in, SAE, Impact Rated No, Bolt Clearance 5.4 mm, Standards ASME B107.110-2012 This industrial-grade mechanic's 8-pt. standard socket is designed for heavy-duty applications and production use. It is made of professional-quality chrome vanadium and fully polished. The 8-pt. design is used for applications that required square nuts or bolts with square heads. They can also be used on square pipe plugs and set screws.