... Made by professtional geo -equipment and tooling manufacture. Diamond reamer has various dimension for different drilling processes, including ... granite, quartzite, hard slate, chert, basalt, etcHot-Pressed Diamond Drill Bit Hardness & Rock Drillability Grade FormRock Drillability GradeBit ... , Mixed Gnesiss, Tuff, Rock and other mixed Light Particles.930-32, 33-35Carbide Powder Mixed Rock, Granite, ...