A. Classified by structure
(1). End-welding drills, where the top of the drill is welded by carbides.
(2) Integral drill: The drill head, drill body and drill shank are integrally manufactured from the same material.
B. Classified by drill collar
(1) Taper shank bit: The shank of the bit is tapered, and its taper is generally Morse taper.
(2) Straight shank drill: The diameter of the drill is less than 13.0mm, all adopt straight shank.

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