GRIPEDGE HEX Bit Socket Set | 7-PC – 3/8″ Drive Short SAE RPT Hex Driver Set | Sizes 1/8″ – 3/8″ | Made With S2 Steel | Includes Premium Aluminum Storage Rail |. GRIPEDGE – ITS ABOUT THE GRIP GRIPEDGE RPT (Rounding Prevention Technology) Hex bit sockets are designed to replaced standard hex tools.