For controlled screw tightening, use a torque wrench with 10 mm = 3/8" drive, e.g. HAZET 6110-1 CT Drive: Square, hollow 10 mm (3/8 inch) HAZET – high-quality tools as well as best fabrication – for a long tool life For controlled screw tightening, use a torque wrench with 10 mm = 3/8" drive, e.g. HAZET 6110-1 CT Drive: Square, hollow 10 mm (3/8 inch) HAZET – high-quality tools as well as best fabrication – for a long tool life