Klein Tools Multi-Bit Stubby Screwdriver / Nut driver with ratcheting mechanism lets you work faster and with more efficiency. Includes 1/4-Inch and 5/16-Inch nut drivers. With its Cushion-Gripâ„¢ handle, the stubby interchangeable screwdriver/nut driver was designed for comfort and efficiency. Made of the highest-quality tempered steel, the strong, durable tips are manufactured with square edges to securely fit screw opening. They resist slippage and provide positive turning action. The strong nut driver function improves bit-holding power, even for tough applications.