Step Drill Bit, HSS Metal Countersink Drill Bit 4PCS 4-12/20/32mm Step Drill Bit Steel Countersink Drill Triangle Conical Drill with Titanium Coating Screwdriver Drilling for Steel

【3+1Size】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 drill can handle holes of different sizes【Sturdy and Rustproof HSS】Made of high quality HSS, it cuts thin materials quickly. HSS provides extreme durability, and the drill bits are rust-proof. At the same time, our drill bit is suitable with electric screwdriver【Application】Step drill bit suitable for DIY, home and construction. It is very suitable for drilling holes in a variety of materials like steel/brass/wood/plastic/thin iron plate/aluminum materials/insulating plate/PVC plate, etc.Only suitable for ordinary aluminum, iron and steel plates (thickness cannot exceed 4mm, hardness is less than 25HRC), not for stainless steel【Twist Drill Bit】With 4mm HSS 6542 Twist Drill Bit can pre-drill materials, which makes the step drill bit less easily damaged than ordinary step drill bit. Note: Oil the stepped bits before each use to maximize life. 6542 twist drill is stronger than others High quality HSS hex shank drill is made of high quality hardened steel, hard to damage with titanium coated to reduce friction and heat. Do not use the center punch, compared with ordinary twist drill is not easy to breakDouble Spiral GrooveTwo flute design provides faster, smoother and cleaner cutsPracticalSuitable for DIY, home and general purpose building/engineering.Can be used for wood, sheet metal, steel and other surfaces. including steel, brass, wood, plastic, etc. Sold by Bianco FR store