Description:* M35 Cobalt (HSS Co) Drill Bit is a high hardness step drill bit that is mainly used for drilling high hardness steel, such as flat stainless steel and hardened steel. M35 step drill bit can be used to drill flush stainless steel holes.* Function: deburring, chamfering, cutting or expandable holesSpecification:* Material: M35 HSS Co* Type: spiral flutes* Color: as picture shown* Size: 4-20mm (4, 6, 8, 10, 12, 14, 16, 18, 20mm)* Rotation Speed: 180-240* Quantity: 1 pcPackage Included:1 * Step Drill Notes: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.