Features: *The drill has 2 functions of reaming and chamfering, which can improve the processing efficiency, and the second stage angle is 180 degrees or 90 degrees. *For example, for drilling 2 holes, the installation of six angle nut, etc., can replace more than drill. *The countersunk head is made of HSS, which can process metal or non-metal products below 30 degrees HRC,such as cast iron, tool steel, copper and aluminum, alloy steel, iron, die steel and so on. *Due to batch reasons, the total length may be different, which does not affect the use. Specifications: Product name: Spiral step drill bit Material: HSS Color: Black Optional Degrees: 90, 180 Optional Size: M3, M4, M5, M6, M8, M10, M12 Suitable for: Drilling, Chamfering Quantity: 1 Pc Package Contents: 1 × Spiral step drill bit Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data.