Century 66804 Impact Pro Magnetic High Impact Nutsetters, 4-Piece Impact Pro magnetic high impact nutsetters are for use in high torque and standard drivers 4 piece set includes 1/4-Inch 5/16-Inch 3/8-Inch and 7/16-Inch magnetic high impact nutsetters Magnetic tip for fast and easy nut driving 1/4-Inch power drive shank Approximately 1-7/8-Inch length