ARMSTRONG 12Pt. 1/4″ Drive Sockets 3/16 7/32 5/16 3/8 7/16 1/2 9/16Manufacturer Part No.10-110UNSPSC27111704ManufacturerArmstrong Industrial Hand Tools Product AttributesBolt Clearance0.172″Drive Size1/4″FinishChromeLength0.82″MaterialHeat Treated Alloy SteelNumber of Points12Size5/16″SpecificationANSI B107.1, Federal GGG-W-641eStyleSAETypeStandard SocketProduct Weight0.02 NotesThin wall design with precise nut end dimensions for industrial specifications.Radius corner design provides 15-20% more torque, extends fastener life and reduces slippage.Laser etched size markings make it quick and easy to find the right size for the job.