Proto® Open End Wrench, Measurement System: Imperial, 5/16 x 3/8 in Wrench Opening, 5-1/8 in Overall Length, 25/32 x 41/64 in Open End Width, 13/64 in Open End Thickness, Angled/Double, 15 deg Head, 7/16 x 3/8 in Throat Depth, Flat Handle, ASME B107.100 Specifications Met, Alloy Steel, Satin