Box End Wrench, Alloy Steel, Chrome, Head Size 9 mm, 10 mm, Overall Length 5 1/2 in, 0°/ OVERALL LENGTH: 140.2 MILLIMETERS NOMINAL WRENCHING SURFACE SIZE: 9.0 MILLIMETERS NOMINAL FIRST END WRENCHING SURFACE SIZE: 10.0 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