HSS Titanium Step Drill Bit 4-12/20/32mm Spiral Straight Groove Conical Stage Drill Wood Metal Hole Cutter Cone Drilling Tool

[Special Note]: HRC (high breaking capacity); Our products are divided into two hardnesses, HRC62 and HRC67. The first material is HRC62 (marked as A-B on the picture), drilled plastic, wood, and aluminum are all right. But if you need to drill steel or iron plates, or want a longer tool life, we recommend that you choose the second material HRC67 (C-D-E-F-G is indicated on the picture).

[Advantage]: 1. Step drill shank is triangle/hex shank, stable clamping, not easy to slip. 2. "X" shaped openings, drilling is not easy to slip. Higher precision, more sharper, burr-free drilling. 3. The surface is titanium coating, more wear resistance, oxidation resistance, no rust. 4, The unique step structure, a drill can drill a variety of sizes of the aperture. You can deburr, chamfer, punch an ellipse. 5. The hardness of the workpiece below the use of 25 ° below, such as iron, aluminum, PVC board, insulation board, wood, workpiece thickness 4mm. 6. Suitable for installation in the pistol drill and bench drill.