TKSM-173 TAKASHIMA D-13 TORX T7 120-DEGREE GRADE 12.9 HARDENED CARBON STEEL SCREW SET FOR XRAY X4 26HIGHTLY RECOMMANDED: WHY TORX SCREWS ARE SUPERIOR TO HEX (ALLEN) SCREWS 1. SUPERIOR TORQUE TRANSFER (ANTI STRIPPING) Hex: Only has 6 points of contact. The force is concentrated on the sharp corners, making it very easy to "round out" or strip the socket under high pressure. Torx: Features a circular lobular design that provides a much larger contact area. It transmits force through "surface contact" rather than "point contact," allowing it to handle