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Product Origin:China
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Description:Features: 1) Titanium drill bit set: manufactured from high speed steel with titanium nitride coated and can last 6 times longer than standard bits 2) Twist drill bit set: manufactured from high speed steel with industrial black finished 3) Cobalt drill bit: can last 12 times longer than standard drill bits, with 135 degree split point, and is used for drilling in tough, high tensile strength materials