... : rolling thread, textured, ruled, roll bars etc FR-38x30 Thread Rolling Machine, pipe forming machine,metal pipe thread rolling machine ... work pieces real roundness when by rolling.2, Fixed Roll/ Pass two applied.3, Adopt Taiwanese column injection ... , textured, ruled, rolling light, cross knurling, roll bars, rolling groove, and roll-offQuality Process Certifications: ISO 9000-2001 Quality guarantee ...