The Makita Impact XPS® 3 Pc. Square 2" Socket Adapter Set (E-01600) is expertly engineered to withstand the hardest hitting impact drivers (sold separately). The Socket Adapter Set features a retention ball that helps secure the socket when in use. It features chamfered edges on the square drive end, which allows for easy installation of the socket. The E-01600 is engineered with a calibrated heat-treating process for added durability. The Socket Adapter features a Matte Nickel surface for best-in-class corrosion resistance. The optimized torsion zone geometry facilitates an ideal transfer of impact energy for improved adapter life. It is expertly engineered to withstand the hardest hitting impact drivers. Included in the 3 Piece Socket Adapter Kit is one each of 1/4", 3/8", and 1/2" Socket Adapters.