... Made by professtional geo -equipment and tooling manufacture. Diamond reamer has various dimension for different drilling processes, ... etcFlat Bottomed Type, Arc-shaped Type, Steps Shaped Type(PDC coring or non-coring)MediumLimestone, marble, dolomite, rhyolite, ... , quartzite, hard slate, chert, basalt, etcHot-Pressed Diamond Drill Bit Hardness & Rock Drillability Grade FormRock Drillability GradeBit ...