... 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 ... -43431160DCD-50501160DCD-60601160 1. Applicable material : Professional engraving tools for hard materials, such as stone, granite, gravestone , ceramic ...