Williams MS-4-23RC 23-Piece 1/2-Inch Drive Metric Shallow 6 Point Impact Socket Set 23-Piece set Suitable for use with pneumatic and electric impact wrenches Designed for quick engagement on 6 point fasteners Sockets feature super torque lobular openings for greater turning power without deforming the fastener Specially heat treated for impact use to provide long life, safety, and durability