HSS Titanium Step Drill Bit 3Pcs Spiral Straight Groove 1/4 Hex Shank Metal Wood Hole Cutter Cone Core Drilling Power Tools

[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-C-D 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 (E-F-G-H-I-J-K is indicated on the picture). [Specification]: 4 - 12mm 5 Steps (4-6-8-10-12mm) Or 9 Steps (4-5-6-7-8-9-10-11-12-mm) 4 - 20mm 9 Steps (4-6-8-10-12-14-16-18-20mm) 4 - 32 mm 15 Steps (4-6-8-10-12-14-16-18-20-24-26-28-30-32mm) [Advantages]: 1. Step drill is triangle round handle or hexagonal handle, prevent sliping. 2. "X" shaped openings, drilling is not easy to slip. Higher precision, more sharp, burr-free drilling. 3. The gold is titanium coating, more wear and oxidation resistance, not rust. 4, The unique step structure, a drill can drill a variety of sizes of the aperture. You can deburring, chamfering, punching elliptical hole. 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. [Packaging]: As shown in the picture, there are ordinary plastic bags, blue cloth bags, single white pull-out box, and wood box. The packaging method is in the upper right corner of the picture. The top right corner of the picture is not shown, it is plain plastic bag packaging.