Tube and Sheet Drill, Cobalt, Bright (Uncoated), 3 mm to 30.5 mm Size Range, Straight with Three Flats, 6 mm 8 mm 9 mm Shank Hex Size, 6 mm, 8 mm, 9 mm Shank Diameter, 58 mm, 71 mm, 76 mm Overall Length, Maximum Drilling Depth 3 mm, 4 mm, 16 mm