WR O E 1/2 X 9/16 THIN Unique arc design increases surface contactTappet style wrench for use on jam nuts and in confined areas Opening Size: 1/2 in, 9/16 inOpening Type: Open/OpenHead Width: 1 13/64 in, 1 9/64 inHead Thickness: 11/64 inHead Angle: 15 Open SideOverall Length: 10 inHandle Type: FlatMaterial: Forged Alloy SteelFinish: ChromeMeasuring System: InchWt.: 0.17 lb