8 1/2 Inch 637 Roller Bit Single Cone Drilling Roller Palm Piece / Tricone Bit /one Cone Bit for Drilling Water Drilling Rig Parts
A good quality roller bit are made from high quality tungsten and good bearing system. Baorui roller bits are manufactured by the high quality 100% new hard carbide, the roller bits could be installed on the core barrel to drill the hard rock which over 80 Mpa.