characteristic: Step drill has excellent sharpness and durability because of its structure and titanium coating of industrial high-speed steel. The bifurcated tip can accelerate the cutting speed and increase the wear resistance. Double groove design provides smoother cutting and can quickly remove chips. Suitable for drilling stainless steel, plastic, aluminum, iron and many other types of metal plates. All cone drills adopt neat and orderly aluminum casing, which is convenient for transportation and storage. There are 5 standard drill bits and 1 automatic center punch. Please mark the points you want to drill to easier to drill. You can drill holes of different sizes to meet your DIY needs. describe Name: integrated step drill set Material: high speed steel colour: gold Package Contents: 1 x Integrated step drill set Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.