3-piece HSS stepped drill bit set: spiral groove peeling drill, cone drill, metal drill, cut tool set for metal, wood, plastic, etc. 4-12mm / 4-20mm / 4-32mm.

【Size】 4-12 mm / 4-20 mm / 4-32 mm. Conical tip with a stepped profile used to drill 19 different hole sizes from 4-32 mm, replacing 19 individual drill bits. Self-starting, no pre-drilling required. 【Material】 Made of high-quality 4241 HSS (high-speed steel) and titanium-coated for extended durability. 【Application】 Ideal for cutting holes in various materials, including steel, sheet metal, wood, plastic, etc. This drill bit can meet your needs. 【Advantage】 Automatically deburrs holes left by other drill bits because the rapid increase in pitch to the next size allows the cutting edge to scrape burrs from the workpiece entry surface. Good chip removal and a clean cut save both time and effort. 【Performance】 The unit's length and the ability to vary the finished hole diameter are advantages when working with chassis or front panels. The finished hole can often be made particularly smooth and burr-free, especially in plastic. Product Features: 1. No pilot drill required. 2. Titanium coated to reduce friction and run more smoothly. 3. The bit has a 3-sided shank. 4. Automatically deburrs holes as you drill; high-speed steel, durable. 5. Widely used for cutting holes in a variety of materials such as steel, wood, thin iron, aluminum alloy, insulation boards, PVC film, etc. Specification: Color: Gold (as shown in the picture) Material: High-speed steel Surface: Titanium coated Scope: Thin iron plate, aluminum, insulation boards, 4mm thick PVC boards, and wood. Size: 4-12 mm 9 steps (4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm), 7 cm (L) 4-20 mm 9 steps (4 mm, 6 mm, 8 mm, 10 mm, 12 mm, 14 mm, 16 mm, 18 mm, 20 mm), 7 cm (L) 4-32 mm 15 steps (4 mm, 6 mm, 8 mm, 10 mm, 12 mm, 14 mm, 16 mm, 18 mm, 20 mm, 22 mm, 24 mm, 26 mm, 28 mm, 30 mm, 32 mm), 10 cm (L) Package contents: 1 x twist drill bit 4-12 mm 1 x spiral fluted drill bit 4-20 mm 1 x drill bit helical of 4-32 mm