1)Revolving Spindle is the parts of the assembles. 2)ISO9001, ISO13485, ISO14001. Name:Revolving Spindle.Material:Iron.1) High precision metal machining parts.2) Min Tolerance: +/- 0.01mm.3) Surface treatment: Black; Zinc, Nickel, powder coating, sand blasting etc4) Certification: ISO16949, ISO9001, ISO14001, ISO13485high precsion metal parts; metal components parts