Description: Material: The step drill bit are made of sturdy high speed steel, ensuring durability and longevityFeature: Unique stepped structure, a drill bit can open a variety of sizes and apertures, and a stepped drill hits a box of drill bitMultifunction: Pagoda Step Drill has various functions. It makes it possible to perform functions that cannot be accomplished by deburring, chamfering, hole opening, and twist drillGroove Design: The unique groove design allows for faster, smoother, and cleaner cuttingVersatile: These step cone drill bit are suitable for drilling holes in a variety of materials including steel, brass, wood, pp and more Specification: Material:High Speed Steel Size Chart: Package Size: 15.1cmx10.3cmx4cm/5.94inchx4.06inchx1.57inch 14cmx10cmx3.5cm/5.51inchx3.94inchx1.38inch Package Includes: 1 Set Step Drill Bit Note: 1. Please allow slightly error due to manual measurement.2. Due to the difference between different monitors, the picture may not reflect the actual color of the item.3. Wish you a wonderful online shopping!