1.Reasonable price 2.Longer life-span than electroplated tool 3.faster cutting speed 4.good for marble,granite,glass,tile LOXA Diamond Tools specialized in diamond tools: diamond core drill, carbide glass bit , diamond engraving bits for CNC engraving machine and CNC router, glass etc. Excellent diamond which especially use on rock, granite , marble ,tile , porcelain and concrete. Our products ...