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Features: High speed steel, polished. Carry aluminum case. Two flutes, automatically deburs as you drill. Tri-flat shank for sure grip. 6mm Shank: 4 to 12mm, 9 steps (4, 5, 6, 7, 8, 9, 10, 11, 12mm). 4 to 12mm, 5 steps (4, 6, 8, 10, 12mm). 8mm Shank: 6 to 18mm, 7 steps (4, 8, 10, 12, 14, 16, 18mm). 4 to 22mm, 10 steps (4, 6, 8, 10, 12, 14, 16, 18, 20, 22mm). 10mm Shank: 6 to 35mm, 13 steps (6, 8, 10, 13, 16, 18, 20, 22, 25, 28, 30, 32, 35mm).