Cobalt high speed steel along with the titanium coating ensures extreme durability, will stay new and shiny for years to come. Non-walking drill tip provides fast and smooth drills on steel sheets, aluminum sheets, wood board, plastic board etc. (the board must be smaller in thickness than the height of step drill bits). Please mark the spot that you are to drill for easier drilling and improved drill bits life. Cobalt coated for smoother cooler cutting. SELF STARTING - No need for a pilot hole. Cobalt coated to reduce friction and run cooler 3-sided 1/4" shank to prevent slip in drill chuck. Automatically deburrs holes as you drill. Long life true M2 high speed steel.

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1/8" to 1/2" 13 Steps (1/8", 5/32", 3/16'', 7/32", 1/4'', 9/32", 5/16", 11/32", 3/8'', 13/32", 7/16'', 15/32" , 1/2'')