Dmax Power 3-piece Hss Step Drill Set.

Made from High-Speed Steel (HSS) with heat treatment and Titanium Nitride coating. Designed to auto-deburr the cut hole. Features a triangular shank that prevents spinning in the chuck. Includes three bits with drilling ranges of 4-12 mm, 4-20 mm, and 4-32 mm. Can be used on most metals, plastics, and wood.