This is a set of twist drill: HSS 19pc polished bright drill 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. 4341 cutting tools of HSS have a higher performance,although it is cheaper than fully ground, the Hardness can reach 62°-64°.

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