【HIGH SPEED STEEL】The step drill bit is made from high speed steel which has high hardness and good wear resistance.
【 COATED 】The surface of step drill bit set is coated with which has better anti-rust performance and will not fade easily.
【4mm-20mm】This single drill bit can be used for drilling a wide range of hole sizes from 4mm to 20mm, can be widely used.
【WIDE APPLICATION】Step up drill bit is most commonly used on softer materials such as thin iron sheet, aluminum, PVC and wood board of 4mm or .Great for use in work where thin steel, aluminum or plastic boxes and chassis are encountered.
【CLEARLY MARKED】The hole size are clearly marked on the surface, you can check the data easily.
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