by Stone Tools
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The Stone Tools Model Number ST-334 Tri Tip Titanium - Cobalt Step Drill is coated with titanium and then cobalt to last up to 12 times longer than high speed steel step drills and 6 times longer than titanium step drills. Tri tip design with 3 flutes requires less torque and runs cooler. This unique Step Drill Bit is designed for the professional who needs a tool that makes precision cuts, and offers extra long life. Hole sizes from 3/16-Inch to 7/8-Inch . 3/8-Inch shank.
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