Williams 37916 11-Piece 1/2-Inch Drive Metric Universal 6 Point Impact Socket Set 1-Piece 1/2-Inch drive metric universal 6 point impact socket set features the super torque lobular openings for greater turning power without deforming the fastener These sockets are designed for maximum engagement on 6 point fasteners and are suitable for use with pneumatic and electric impact wrenches Each socket has a black industrial finish and the size of the set ranges from 13 to 23 millimeters Drive end features pin retention hole and groove Specially heat treated for impact use to provide long life, safety, and durability