... Hole Diameterφ42,φ55,φ60,φ75,φ90,φ108,φ113Coupling Dimensionectangular Thread, coupling withφ42,φ50,φ63.5,φ70 of drill rod etcSpecial ... lathe, and the diamond segment adopts high-class abrasive material with high-precision, long service life and rapid speed. The bits ... can be used together with various drill machine in underground coal mine.