タイトルまたは説明

The drill bits are with features of cemented carbide s, reasonable designs, three kinds of faces design, longer service life, various usages, high penetration rate, deep boring hole, good after-sale service, reliable quality promise and so on. They can be designed to be with convex, concave and flat faces, and also with ballistic, hemispherical teeth, which is fit to different requirements of rock formations.