Stepped Titanium Coated Spiral 4 20Mm Review

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