The honidriver system fits Metric 6pt, Metric 12pt, SAE 6pt, SAE 12pt, E-TORX, Spline, Square & 50% rounded off nuts & bolts
Square drive size: 3/8"(9.5mm) Length: 28~32mm
Size: 8-9-10-12-13-14-17-19-21-22mm , Material: Chrome vanadium