4mm to 12mm Spiral Flute Step Drill Bit, High Speed Steel Titanium Coated, Metric Hex Shank, HSS Tool For DIY Plastic Wood Steel Metal Aluminum Copper. Cone Cutter Hole Cutter Drill Bit

• 2 flute spiral groove step drill - Gives a good fast and smooth cut. 4-12mm - This metric step drill has 5 steps - 4mm 6mm 8mm 10mm and 12mm. So you can drill accurate holes to any of these sizes.
• Suitable for cutting holes in a variety of materials including steel, brass, wood, plastic, aluminum copper, gypsum board, metal material, fiberglass, and PVC etc, convenient to store in bag, car, or at home. Ideal for professional and home use
• HSS (high speed steel) with a titanium (Tin) coating - The titanium coating makes it easier to drill materials and also gives an improved tool life. Where possible use coolant to increase the tool life even further.
• 1/4"(6.35mm) hex shank - will fit in any drill with a standard chuck and any pillar drill.
• Each step is clearly marked with the diameter

Step up drill bit sets. These DIY tools are a greats addition to any tool set and are great power tool accessories. They are supplied in a plastic storage case.