Impact Socket, Socket Size 1 3/8 in, Socket Shape 6-Point, Drive Type Impact, Drive Size 3/4 in/ OVERALL LENGTH: 3.250 INCHES NOMINAL WRENCHING SURFACE SIZE: 1.375 INCHES NOMINAL SINGLE END DRIVE SURFACE SIZE: 0.750 INCHES NOMINAL SINGLE END FEATURES PROVIDED: POWER TOOL WRENCHING SURFACE SHAPE: 6 POINT SINGLE END INTERNAL DRIVE END SHAPE: SQUARE SINGLE END INTERNAL SPECIAL FEATURES: THIN WALL MATERIAL: STEEL OVERALL SURFACE TREATMENT: OXIDE OVERALL STYLE DESIGNATOR: 168 INTERNAL-INTERNAL SPECIFICATION/STANDARD DATA: 05047-ASME B107.2 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD NONDEFINITIVE SPEC/STD DATA: 1 TYPE AND 5 CLASS