I-Core Bit enezigaba ezintathu
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Ibhithi Yezigaba Ezintathu (Coupling+Tube+Bit)
Ikakhulukazi esetshenziselwa ukubhola ukhonkolo, ukhonkolo oqinisiwe, isitini, ibhulokhi njll. Ngokushesha, ngokushelelayo nokuphila ende.Ingxenye kuma-core bits ingaba uhlobo olujwayelekile, Uhlobo lwe-Turbo
Imishini: I-drill ebanjwa ngesandla, umshini wokubhoboza.Ukusetshenziswa okumanzi.