... 9001:2008 certified 2.OEM manufacturer 3.+/-0.01mm tolerance 4.QC inspect after products finished 5.spring clip Product name Industrial ... Chrome plated), polishing(precision can reach +/-0.005mm), knurling, anodizing, Black Oxide, heat treatment, sandblasting etc.Precision processingturning, milling, drilling, grinding ... High-quality, well-fame credit ,and good materials torsion spring clip