"Enhanced 6-point contact design with socket teeth that grip the flat sides of the fasteners to drive a nut that is 70% rounded off","Unique non-slip design that protects and works on 6-point, TORX and 70% rounded off nuts and fasteners","Easier identification with high-visibility laser and impression stamped size markings 1/4" DRIVE 13MM METRIC PRO NON-SLIP IMPACT SOCKET APA13M | Matco Tools