Core ganga

Ana amfani da ganga Krerel don yankan wani zobe na shekara a dutsen ko kankare (Alsororeinformorcececreces). Cibiyar cibiyar yawanci tana karye tare da chisel, da tsufa ko giciye - yanke. Amfanin da aka yi amfani da shi shine maida hankali ga ƙarfin taron da kuma torque a kan ƙaramin zoben yankan hakora. Ra'ayin diamita da aka dace da bututun mai da shambura. Sauran tsayi da diamita za a iya kawo su kan bukatar. Masu nauyi suna kimanta dabi'u.