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The hollow drill is a new type drill, which is being widely used in the mechanical processing. This drill can drill in any place, the efficiency of which is ten times that of the common twist drill, with the precision controlled in the range of ±0.05mm. It feels light to cut, possessing the unique function of broadening the hole, half-the-hole drilling, slant-hole drilling, coring, etc. The aiguille will prop out automatically when the subject is drilled through. The handle of the hollow drill can be replaced by the inner cooling handle, which shall cool down during working, thus greatly lengthening the life of the knife.
JM58 type quick change drill chuck