Box End Wrench, Alloy Steel, Chrome, Head Size 7 mm, 8 mm, Overall Length 4 1/4 in, 0°/ OVERALL LENGTH: 108.7 MILLIMETERS NOMINAL WRENCHING SURFACE SIZE: 7.0 MILLIMETERS NOMINAL FIRST END WRENCHING SURFACE SIZE: 8.0 MILLIMETERS NOMINAL SECOND END WRENCHING SURFACE SHAPE: 6 POINT BOTH ENDS INTERNAL MATERIAL: STEEL OVERALL SURFACE TREATMENT: CHROMIUM OVERALL STYLE DESIGNATOR: 144 STRAIGHT DOUBLE HEAD