YN-1218 stone cnc engraving machine 1 Taiwan linear rails,Germany ball screw 2 strong structure--stable 3 cost- ... stone engraving with cost-effective priceFeatures:a. Adopt Taiwan square linear rails and Germany ballscrew, with our professional design, could guarantee ... , 12.73.175, 6, 12.73.175, 6, 12.7XYZ Guide RailsLinear Square RailLinear Square RailLinear Square RailTransmissionRack Gear of X ...