OOTDTY Feature: Professional step drill bit design for precision drilling of holes of various sizes from 5mm to 35mm. In diameter, optimum speed and accuracy. You can achieve one-time processing of large holes, without the need for drill and positioning hole. Made of HSS, no need for pilot holes. Mark hole locations and double-notched design, making drilling faster and smoother. Surface depth indicators make drilling precise. The sizes are laser etched into the metal, so they won't wear out even after repeated use, make precise drilling easier. Widely used for cutting holes in various materials, such as steel, wood, thin iron, aluminum alloy, insulation boards, pvc sheet, etc. Twist drill bit only, other accessories demo in the picture are not included! Specifications:Item Name: 5-35mm Twist Drill Bit Type: 5-35mm (5,7,10,12,15,17,20,22,25,27,30,32,35mm)Material: High Speed SteelSize: app.73x13mm/2.87x0.51in Color: SilverQuantity: 1 Pc Note:Please allow 0-1cm error due to manual measurement. Pls make sure you don't mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Included:1x5-35mm Spiral Fluted Drill Bit