I-drill bit ebukhali iwukhiye wokusebenza kahle, ukunemba, nokuphila isikhathi eside kunoma yimuphi umsebenzi wokumba. Noma ngabe kusembonini yokukhiqiza, ukwenza insimbi, noma ukwakha, ukunakekela izingcezu ezilolwe kahle kuqinisekisa ukusikeka okuhlanzekile, ukubhola okusheshayo, nokunciphisa...
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