Features: Ideal for use with high torque impact drivers and driver-drills Retention ball helps secure the socket Chamfered edges of square drive end allow easy installation socket Calibrated heat treating process for added durability Details: Makita® Impact XPS™ is new innovation in fastening with insert bits and fastening accessories built for the demands of the professional contractor. The ImpactXPS Square Socket Adapters are designed exclusively for use with high-torque impact drivers, and are engineered to last up to 90-times longer than standard adapters. Chamfered edges of the square drive end allows for easy installation and a retention ball helps secure the socket. The high quality steel construction provides increased durability and features a matte nickel surface for best in class corrosion resistance. This set includes a 1/4" , 3/8" and 1/2" socket adapter.