1. Taiwan high precision preloaded away gap ball screw 2.Portal type move, strengthen the mesa 3.ZK-1218 AD engraving machine ZK-1218 AD engraving machineApplicable scope: Used for carving of various kinds of double color boards at the sign, organic glass, the Vatican's house, the three dimensional stone billboards, decorate gifts, double color boards used for carving of various kinds of tags, ...