"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 1/4" DRIVE 9/16" SAE 6 POINT DEEP PRO NON-SLIP IMPACT SOCKET ADPA186 | Matco Tools