Williams MS-12-18H 18-Piece 3/8-Inch Drive Metric Deep 6 Point Impact Socket Set 18-Piece set Suitable for use with pneumatic and electric impact wrenches Designed for maximum 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