These custom precision flange bushings were produced domestically in the USA using 18-8 stainless steel material.  The overall length measured .630" +/-.01" and the part incorporated both an external flange and an external flange per customer supplied drawings.  The OD on the barrel portion is .5" and .585" at the external flange, both with the same +/-.01" tolerance.  ID on the inside barrel portion is .45".