Triton TWSD36 Square Driver Set 76mm 3\" / 152mm 6\" x2 Pcs 394952 Triton TWSD36 Square Driver Set Solid, single-piece premium alloy steel construction with #2 square drive magnetic tips. Quick-change compatibility for fast and easy bit changes. Features a 6.3mm (1/4\") hex shank for use with standard chucks of 9.5mm (3/8\") diameter. Overall lengths 76mm (3\") and 152mm (6\"). FEATURES Solid, single-piece premium alloy steel with #2 square drive magnetic tips Features 6.3mm (1/4\") hex shank Quick-change compatibility for fast & easy bit changes For use with standard chucks of 9.5mm (3/8\") diameter SPECIFICATION Lengths: 76mm (3\") & 152mm (6\")