Torque Adapter, Drive Size 3/8 in, Size 3/8 in, Overall Length 2 11/16 in, 0°, 12-Point Box End/ OVERALL LENGTH: 2.688 INCHES NOMINAL WRENCHING END OUTSIDE DIAMETER: 0.563 INCHES NOMINAL WRENCHING SURFACE SIZE: 0.375 INCHES NOMINAL SINGLE END DRIVE SURFACE SIZE: 0.375 INCHES NOMINAL SINGLE END WRENCHING SURFACE SHAPE: 12 POINT SINGLE END INTERNAL DRIVE END SHAPE: SQUARE SINGLE END INTERNAL MATERIAL: STEEL OVERALL SURFACE TREATMENT: CHROMIUM OVERALL STYLE DESIGNATOR: 19 BOX END