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Check the listing for details. HSS Step Drill Bit Set Large Cone Titanium Bit Set Hole Cutter 6/8/10mm Shank. Condition: New. Listed at 14.28 USD. Two-Flute Spiral Groove Design: Enables a faster, more stable and smoother cutting. It can automatically chamfer the hole to clean the drill bit. HSS & Titanium Coated: Made of super strong HSS steel and coated with Titanium.