Step Drill Bits, 4 x 4-12/20/32mm Triangular Tapered Drill Bits with Titanium Coated Driver

【Size 3+1】 1*72mm: the scale on the drill bit is 4-12. 1*72mm: 4-20. 1*102mm: 4-32. 1*72mm twist drill bit. The drills can handle holes of different sizes 【Strong and rust-proof high-speed steel】Made of high-quality high-speed steel for fast cutting of thin materials. HSS is extremely durable and the bits are rust proof. At the same time, our drill bits are suitable for electric screwdrivers 【Application】The step drill is suitable for DIY, home and construction. Ideal for drilling holes in various materials such as steel/brass/wood/plastic/sheet metal/aluminum/insulation board/PVC board. Only suitable for ordinary aluminum, iron, steel plate (thickness can not exceed 4mm, hardness less than 25HRC), not suitable for stainless steel 【 【Twist Drill Bit】 HSS 6542 4mm twist drill bit can be used to pre-drill the material, which makes the step drill bit less damaged than ordinary step drill bits. NOTE: Oil the step drill before each use to maximize its life. The 6542 twist drill is stronger