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Dfu2005 Dfu2005-4 20mm Hot Sale Ball Screw C7 Thread Double Nuts Linear Motion Ballscrew for CNC Machine Tool, Find Details and Price about Ball Screw Sfu2005 from Dfu2005 Dfu2005-4 20mm Hot Sale Ball Screw C7 Thread Double Nuts Linear Motion Ballscrew for CNC Machine Tool - Shandong Jingrui Transmission Technology Co., Ltd.