... linear square guideway 5.DSP offline Stone CNC Engraving Machine ZK-9015 Application1.Suitable for natural marble, granite, bluestone, sandstone, artifical stone, tombstone, milestone ... granite stone can be layered engraving to 3mm3. Marble, bluestone can be engraving to 3mm on time.4.Engraving characters,letters, pattern, intaglio, rilievi ...