"Specially heat-treated to provide continuous impact use","Enhanced 6-point contact design with socket teeth that grip the flat sides of the fastener to drive a nut that is 70% rounded off","Easier identification with high-visibility laser and impression stamped size markings","Get the job done easier with a unique non-slip design that protects and works on 6-point, TORX and 70% rounded off nuts and fasteners 1/2" DRIVE 21MM METRIC PRO NON-SLIP IMPACT SOCKET CPA21M | Matco Tools