Smooth drilling and allowing for clean and professional result Increase cutting speed with prevents slipping in the drill Improves cutting efficiency, making this taper drill essential addition to any toolkit Our step drill bit can process different diameter holes, and can be used on materials such as metal, iron, aluminum, brass,, aluminum, wood Featuring a unique step design, this metal step drill allows you to perform drilling, drilling, and deburring with ease, making it equivalent to a box of drills Selected from High Speed Steel, enhances durability and sharpness, ensures the hardness It can reduce perform well in heat and rust resistance, Manufacturer: ERRORY