Nhevedzano: Nei Zvidimbu Zvekudhonza Zvichikundikana | Chinyorwa 9 Mazwi akakosha: 135° split point, split point drill bit, drill point angle, 118° vs 135° point angle, self-centering drill point, chisel edge, drill bit centering geometry Chinyorwa chakapfuura munhevedzano iyi chakaongorora kuti nei zvidimbu zvedrill zvichifamba...