Socket Bit, Insert Length 5 in, Replaceable Insert No, Metric, Tip Size 4 mm, Tip Style Hex/ OVERALL LENGTH: 154.8 MILLIMETERS NOMINAL BLADE LENGTH: 127.0 MILLIMETERS NOMINAL WRENCHING SURFACE SIZE: 4.0 MILLIMETERS NOMINAL SINGLE END DRIVE SURFACE SIZE: 0.375 INCHES NOMINAL SINGLE END FEATURES PROVIDED: MANUAL TOOL WRENCHING SURFACE SHAPE: HEXAGON SINGLE END EXTERNAL MATERIAL: STEEL OVERALL SURFACE TREATMENT: CHROMIUM OVERALL STYLE DESIGNATOR: 187C HEXAGON