Step Drill Bit Set, HSS Metal Milling Cutter 4PCS 4-12/20/32mm Step Drill Bit Steel Milling Cutter Conical Triangle Drill Bit with Titanium Coating Screwdriver Drill for Steel/Wood/Brass/Plastic/PVC

【3+1 Sizes】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 various sizes.

【Robust and Rustproof HSS】Made of high-quality HSS, it cuts thin materials quickly. HSS offers extreme durability, and the drill bits are rustproof. Our drill bit is also compatible with electric screwdrivers.

【Application】Step drill bit suitable for DIY, home, and construction projects. It is ideal for drilling holes in a variety of materials such as steel, brass, wood, plastic, thin iron sheet, aluminum materials, insulation board, PVC board, etc. Suitable only for ordinary aluminum, iron and steel plates (thickness cannot exceed 4 mm, hardness less than 25HRC), not for stainless steel. [Twist Drill Bit] With a 4mm HSS 6542 twist drill bit, the pre-drills materials, making the step drill bit less easily damaged than an ordinary step drill bit. Note: Oil the step drill bits before each use to maximize their lifespan.