This is a set of HSS twist drill bits: HSS 10pc polished Tin coating is used for wood and metal. The drill bit is composed of body and the shank. The design of chip removal pulls material away from the point and out from the hole. Smooth and sharp flutes are better for drill hole. 4241 HSS twist drill bits have a high performance, although it is cheaper than others, the Hardness can reach 60°-63°

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