... , hard chromium plating;2. Wallboard in high quality cast iron material, wall thickness 50 mm, large processing center production;3.Soft roller ... .Six levels of fine grinding gear adopts the 40 cr material, low noise, long service life;8.Die cutting roller cylinder ... ;6.Pushing paper device, the slider for hard aluminum alloy material, qualitative light wear-resisting;7.Block box, push board after ...