Box End Wrench, Alloy Steel, Chrome, Head Size 15 mm, 17 mm, Overall Length 8 in, 0°/ OVERALL LENGTH: 206.0 MILLIMETERS NOMINAL WRENCHING SURFACE SIZE: 15.0 MILLIMETERS NOMINAL FIRST END WRENCHING SURFACE SIZE: 17.0 MILLIMETERS NOMINAL SECOND END WRENCHING SURFACE SHAPE: 12 POINT BOTH ENDS INTERNAL MATERIAL: STEEL OVERALL SURFACE TREATMENT: CHROMIUM OVERALL STYLE DESIGNATOR: 144 STRAIGHT DOUBLE HEAD