3 Piece Step Drill Bit Set, 4-12 mm/4-20mm/4-32mm HSS Cone Drill with Titanium Coating, Double Fluted Steel Metal Drill Bit, Stepped Drill Bit with Hex Shank for Wood, PVC, Metal

【Three Different Sizes】The package includes three cone drills of sizes 4-12mm, 4-20mm, 4-32mm, with different sizes to meet different drilling requirements, a universal standard 6.3mm hexagonal shank diameter, compatible with a wide range of drilling machine models, can be used for aluminum, wood, thin iron, PVC materials, plastic boards, etc. 【Reliable Material】Made of high-quality steel with a titanium coating to increase surface hardness and improve the sharpness and durability of the drill bit, which reduces friction and excessive heat during use, and the double helix design prevents slippage and helps move chips during work. The 118° point design allows you to drill at multiple angles. 【Precise Cutting】Each cone drill bit is laser marked for precise selection, the sharp drill bit cuts more precisely into the material without abrasion, ensures optimal hole spacing, and as the hole diameter increases, the speed of rotation is reduced to ensure a safe cut. 【Double Spiral Design】The double spiral design allows for more uniform drilling and effectively avoids resistance or stagnation during use. It can be used for drilling or reaming, and has a faster speed and accuracy to ensure the clarity of drilling or reaming. Improve work efficiency 【Easy to Use】In order to effectively extend the life of the drill bit and prevent softening or discoloration, the drill bit should be added with water or cutting fluid to keep it at a low temperature when it is working. Clean the surface in time after use to avoid corrosion caused by other substances.