... surface polishing nuts 2,Material:stainless steel& carbon steel 3,Machined to Drawing or Samples 4,ISO, MTC metal good surface ... parts:1, Material: stainless steel&carbon steel&copper alloy2, Usage: auto & motorcycle, mining machinery, building industry, electrical and ... etc.3, Standard: according to the dimension tolerance of machining of customers’ requirement.4, Surface roughness: Ra0.8-3.25, ...