- 50 SIZES IN 5 PIECES STEP DRILL BITS -- The bits set includes five standard step drill bits that can replace 50 individual drill bits and each step drill bit can drill several bore diameters, compatibility with 1/4, 3/8 and 1/2 in. chuck sizes. You don't have to replace drill bit constantly with the step drill bits.
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- HSS Titanium Coating -- The Titanium coating resists the drill bits from corrosion and rust, deduces friction making it easily to do multiple drills on surfaces such as plastic, aluminum, copper, stainless steel, and other types of sheet metal.
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- Automatic Center Punch -- The center punch help you mark the center point that you want to drill, high-impact, spring-loaded strike-through adjusting the cap; it has a deeply knurled surface for nonslip control and prolongs the drills lifespan.
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- WIDELY APPLICATION - The step drill bits can be used to chamfer, bur, and drill or enlarge holes. The step drill bits can work with aluminum alloy, plastic material, and wood.

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