Features: Selected from High Speed Steel, enhances durability and sharpness, ensures the hardness. It can reduce perform well in heat, corrosion, and rust resistance. Smooth drilling and allowing for clean and professional result. Increase cutting speed with self-centering and prevents slipping in the drill chuck. Our step drill bit can process different diameter holes, and can be used on materials such as metal, iron, aluminum, brass, plastic, aluminum, wood Featuring a unique step design with 15 different sizes ranging from 4mm to 32mm, this metal step drill allows you to perform drilling, drilling, and deburring with ease, making it equivalent to a box of drills. The Spirals Grooved design improves cutting efficiency, making this taper drill essential addition to any toolkit. Specifications: Component:Steel Length:Approx.102mm/4.02inch Package Includes: 1Pc Step Drill Bit note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.