... bits, oilfield bits and so on .Specification: diameter from 5-1/8” to 13-1/2”.There are different PDC (polycrystalline diamond ... :1. Andesite, marble, metamorphic schist (For hard, low abrasive formations)2. Gneiss, Diorite, Basalt (For hard and abrasive formations)3. Quartz, ... in the field of mine, transportation, tunnel and hydroelectric for shelving reticular support.Model114,117,127,437,517,617,637 ...