This IRWIN 1837381 set of two 1" square recess torsion bits is perfect for your screw gun and screwdriver needs. These impact insert bits are made of durable materials and are designed for maximum performance. The black color adds a sleek touch to your toolkit. The set includes two pieces and is made in China. The voltage and battery are not specified, but the manufacturer part number is 1837381. These bits are ideal for use in screw guns and screwdrivers, and are a must-have for any DIY or professional project.