... .strict quality control 3.ISO9001:2000 4.investment casting casting wing nuts We are able to supply the products as follows ... Bronze, Malleable Iron etc. 2) Process: Investment Casting, Sand Casting (Resin Sand Casting, Green Sand Casting), Permanent Casting, Die Casting, Centrifugal Casting, Forging ... ) Standard: ASTM, BF,BS, JIS, UNI, ANSI, ISO etc. casting wing nuts