The Bosch PRO 9 Piece 38 Sq Deep Impact Sockets Set is a strong set of sockets designed for impact wrenches. Made from Chrome-molybdenum steel, these are particularly resistant to high torque. You can use the PRO Impact Socket Set to handle hex screws, bolts, and nuts with your square-drive wrench. Bosch have made the sockets in the PRO Impact Socket Set from heat-treated CRMO chrome-molybdenum steel and gave them thick walls to make sure they resist high torque. A black phosphate coating to protects them from rust and corrosion. The sockets are laser-marked and colour-coded so that you can see the one you need right away. They feature a groove and a through hole for securing them on your impact wrench, using our pin and ring whenever you need an extra strong hold.