Feature:1. Cobalt coating reduces friction and operating temperatures and extends its life.2. No need for center punch, not easy to break, can be used for deburring, chamfering and opening3. High wear resistance, high toughness and high strength flexibility4. Made of high speed steel material, high hardness and long service life5. Widely used for perforating various materials, such as stainless steel steel, wood, thin iron, aluminum alloy, moisture-proof board, PVC board, etc.Specification:Item Type: Step Drill BitMaterial: High speed steelStandard(optional): 4-12(5 steps), 4-12(9 steps), 4-20, 4-32.w-e-text table td,.w-e-text table th,;.w-e-text table,Package List:1 x Step Drill BitNote:1. Hand drills and table drills can be used for opening stainless steel, plates can be opened within 1mm by hand drill, and 2-3mm plates can be opened with table drills.2. The speed of the stainless steel opening can not be fast, a few hundred turns can be3. It is best to use water injection or cutting fluid for cooling during processing, which can effectively extend the life of the drill