zinc alloy die casting polishing 1.gear boxes, enclosures, die castings, 2.high pressure die castings, 3.ship accessory zinc alloy die casting polishing: Feature:MaterialAluminum/Zinc Processsand casting, gravity casting, low-pressure die casting, ... machining CNC, milling machine, drilling machine, numerical lathe, all types of lathe. Surface finish process polishing, sand blasting, heat treatment, ...