1.cnc engraver 2engraving for marble,granmtie,sandtone,inkstone,tombstone,steles ... , continuously variable transmission, low noise, complete with carving tools, and embossed carving features.machine double water circulation system, better protection tool.PC ... memory, three-dimensional analog display.applicable to all types of stone and marble, granite, glass, tile, metal, wood, acrylic, aluminum ...