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2000mm ball screw cnc router duy, PNBO Linear Rail Guide 2Pcs HGR20-2000mm Linear Rail with 1Pcs RM1605-2000mm Ballscrew with BF12/BK12 Kit 3 Linear Kit for Sled,3D and CNC Machine: Amazon.com: Industrial & Scientific, Ball Screws, ball nuts and accessoires | USA