A. Sand-blasted bits. For common use. B. Tin-coated bits. For durability and corrosion resistant. C. Diamond coated bits. For professional ues, forbest durability and long time. D. Colour bits. For easier identification.
A. Sand-blasted bits. For common use. B. Tin-coated bits. For durability and corrosion resistant. C. Diamond coated bits. For professional ues, forbest durability and long time. D. Colour bits. For easier identification.