Matco Tools Pro Non-Slip Impact Sockets are constructed of chrome-molybdenum, and are specially heat-treated to provide continuous impact use. An enhanced 6-point contact design with socket teeth grip the flat sides of the fastener to drive a nut that is up to 70 percent rounded off. These sockets feature easy identification with high visibility laser and impression-stamped size markings. The unique non-slip design protects and works on 6-point, torx, and 70-percent rounded off nuts and fasteners.