Adjustable Wrench, Alloy Steel, Black Oxide, 4 in, Jaw Capacity 1/2 in, Plain/ OVERALL LENGTH: 4.000 INCHES NOMINAL WRENCHING SURFACE SIZE: 0.500 INCHES MAXIMUM SINGLE END WRENCHING SURFACE SHAPE: OVAL SINGLE END INTERNAL MATERIAL: STEEL OVERALL SURFACE TREATMENT: OXIDE OVERALL STYLE DESIGNATOR: 3 OPEN END SINGLE HEAD RACK AND WORM ADJUSTMENT