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5pcs Hss Cobalt Multiple Hole 50 Sizes Step Drill Bit Set W/ Aluminum Case.Hss Cobalt Multiple Hole 50 Sizes Step Drill Bit Set.HSS Cobalt Drill Bit Set 50 Sizes Step Tools Multiple Hole.This set replaces 50 individual drill bits.3-sided (TRI-FLAT) shank will not slip in your drill's chuck.Cobalt coated for smoother cooler cutting.SELF STARTING - No need for a pilot hole.Cobalt coated to reduce friction and run cooler.Large bit has 3-sided shank and small bits have hex shank to prevent slip in drill chuck.Automatically deburrs holes as you drill.Long Life TrueM2 high speed steel.Includes protective padded aluminum case.