Lisle 60850 Master Triple Square Bit For head bolts, brake caliper bolts, door handle screws, axle bolts and other applications; the 4 and 5 millimeter bits have 5/16" hex drive The 14 and 16 millimeter bits have 5/8" hex drive The three largest sizes are designed to work on tamper-proof applications The 18 millimeter bit has a 3/4" hex drive The 6, 8, 10 and 12 millimeter bits have 1/2" hex drive