Drill bit 28 30 32 34 38 40 42 50 60 straight cross ball tooth column cold press drill bit

产品特点：

High hardness, corrosion resistance, long service life, impact resistance

产品卖点：

① Exquisite workmanship, reliable quality, high-quality materials selected, good surface gloss and concentricity.

② Corrosion and impact resistance.

③ Easy installation, standard manufacturing process, standardized dimensions, and small errors.