1.cnc engraver 2engraving for marble,granmtie,sandtone,inkstone,tombstone,steles 3.water-proof, ... continuously variable transmission, low noise, complete with carving tools, and embossed carving features.machine double water circulation system, better protection ... memory, three-dimensional analog display.applicable to all types of stone and marble, granite, glass, tile, metal, wood, acrylic, aluminum ...