& OOTDTY Feature: HSS steel, titanium coated to reduce friction and heat. The ladder of its unique design, a little can open up different specifications of the hole. Do not use the middle blow, more compared to traditional twist drills. Deburring, chamfering, elliptical magnification, twist drills, drills, bench drills. It is suitable for cutting holes in various materials, such as steel, brass, wood, plastic, etc. Excellent for use in hardness below 25° artifacts, plate thickness below 5mm. Step drill bit only, other accessories demonstration in the picture are not included. Specification: Material: High Speed Steel Size: 6mm-60mm/0.24inch-2.36inch (6.10, 15, 20, 25, 30, 35, 40, 45, 50, 55 and 60mm)Length: app.106mm/4.17inColor: SilverQuantity: 1 PcNote: 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 Contents:1 x HSS Step Drill Bit