Description:* Made of high quality material, durable and practical to use * M35 cobalt high speed steel drill bits 4-12 / 4-20 / 4-32mm triangular twist drill bit for stainless steel * Mainly for drilling thin steel plates within 3mm. Instead of multiple drill bits, you can use one drill bit. It can process holes of different diameters according to the needs, and can realize one-time processing of large holes without changing drills and positioning holes* Cutting performance: if a hand drill is used, the power must be 550W, the thickness of the cast iron plate is le; 5mm, the thickness of ordinary steel plate is le; 3mm, And the thickness of stainless steel plate is le; 1mm* If used for bench drill, the thickness of the cast iron plate is le; 5mm, the thickness of ordinary steel plate is le; 5mm, and the thickness of the stainless steel plate is le; 2mm Specification:* Material: High Speed Steel * Color: As Pictures Show * Type: Spiral Fluted Hex Shank * Size: (Optional)4-12mm (4, 5, 6, 7, 8, 9, 10,11,12mm)4-20mm (4, 6, 8, 10, 12, 14, 16, 18, 20mm)4-32mm (4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32mm)* Quantity: 1 PcPackage Included:( Optional)1 * Step Drill Bit (4-12mm/4-20mm/4-32mm)Note:1. The actual colors 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.