... steel size: M3-M300 finish:black,plain,phosphate retaining ring for shaft ISO9001:2000 certificate SizeM3-M300StandardDIN471Materialcarbon steel, stainless steelSurface ... produced according to the sample or drawings we specialize in retaining ring, circlips,disc spring ,hose clamps ,parallel key ... ,spring pin and so on.For good quality and after-sales, our products have exported ...