577-5120 Features: -Concentric openings.-Measures 2" from center of adapter opening to center of square drive for easy torque calculations.-High strength, thin wall design.-Applies up to 15pct more torque to fastener.-Reduces risk of fastener rounding.-Drive Size: 3/8 in.-Drive Type: Square.-Locking Type: Ball.-Material: Forged Alloy Steel.-Measuring System: Inch.-Type: Torque Adapter Bit. Color/Finish: -Finish: Nickel Chrome.