ZVD - Step Drill Bit, 4PCS hss Metal Countersink Drill Bit 4-12/20/32mm Step Drill Bit Steel Countersink Countersink Triangle Taper Drill with

【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 【HSS Sturdy and Rustproof】Made of high quality HSS, it cuts through thin materials quickly. HSS provides extreme durability, and the drill bits are rustproof. 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/wooden/plastic/thin iron plate/aluminum materials/insulation plate/PVC plate, etc. Only suitable for ordinary aluminum, iron and steel plates (thickness can not exceed 4mm, hardness is less than 25HRC), not for stainless steel 【 【Twist Drill Bit】With 4mm HSS 6542 Twist Drill Bit can pre-drill the materials, which makes the step drill bit less easily damaged than the ordinary step drill bit. Note: Oil stepped bits before each use to maximize life. 6542 twist