... Our company has aluminum alloy series of aluminum roller HV300 and HV700. 2.Roller adopts high quality aluminum alloy extrusion molding, with ... special cutting tools, measuring tools of Taiwan, make the roller surface roughness of 0.8 mm coaxial tolerance for 0 ... the characteristics of high strength, low resistance, corrosion resisting, light weight, rotating sleek, not rust.7. It is the best choose ...