Two-flutes. HSS.Surface finish of titanium nitride (TIN). The TIN-coating means, reduces cutting forces, long periods of wear, i.e. less tool changes and less risk of swarf build-up. For drilling variable size round and oval holes in thin sheet and plastics, etc. Leaves no burr or deformation. Ideal for galv. sheet 0.1-2 mm as well as stainless sheet 0.1-1 mm.