Ngati ndinu wokonda matabwa kapena katswiri, mumadziwa kufunika kokhala ndi zida zoyenera kuti mukwaniritse zolondola komanso zogwira mtima pantchito yanu. Kwa ophatikizana ndi okonza mapulani, ma helical bits ndi osintha masewera. Muupangiri wathunthu uwu, tifufuza dziko la ma spiral cutter bits, tiwona ...
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