Open End Wrench, Alloy Steel, Black Oxide, Head Size 7/16 in, 1/2 in, Overall Length 6 7/16 in/ OVERALL LENGTH: 6.438 INCHES NOMINAL LARGE END HEAD THICKNESS: 0.234 INCHES NOMINAL SMALL END HEAD THICKNESS: 0.234 INCHES NOMINAL WRENCHING SURFACE SIZE: 0.438 INCHES NOMINAL FIRST END WRENCHING SURFACE SIZE: 0.500 INCHES NOMINAL SECOND END WRENCHING SURFACE SHAPE: OVAL BOTH ENDS INTERNAL SMALL END HEAD ANGLE: 15.0 DEGREES NOMINAL LARGE END HEAD ANGLE: 15.0 DEGREES NOMINAL MATERIAL: STEEL OVERALL SURFACE TREATMENT: OXIDE OVERALL STYLE DESIGNATOR: 104 DOUBLE HEAD