... long service .*Germany-imported Ball Screw Rod , imported linear guide rail on x / y / z ,high precision ,more durable ,rack ... / Stone Engraving / Carving CNC Router Machine Applicable materials : Aluminium plate , aluminum composite panel , plastic board , PVC , acrylic , double-color board , ... Diameterφ3.175-φ12.7Model of OperationStepper Samples: Fastrack aluminum cutting machine JCL 2040