... Machine 2.Longer life-span than electroplated tool 3.faster engraveing speed LONGXIANG stone engraving bits include A, B, C, D, E , F ... materials .We could find a better precept for using our bits and right parameters of engraving machine. C series: Smelting and ... engraving : Multifunctional, like 3D relief sculpturing ,cutting and thick line-relief U-shaped bottom text ,etc. 3. Payment: Escrow is ...