... multi-layer screw, Z and other structure.3.Processing: Hard Chrome plating (Dupont formula), ... transform <= 0.02mm, concentric <= 0.005mm.5.Application: plastics, leather, paper, metal, film and ... roller, embossing roller, mirror roller, heating roller, cooling roller, woolen paper roller, rubber roller, ink proofer, knurling tool, chrome roller, teflon roller, ceramic roller, stainless steel roller ...