Helical gear High qulity, competetive price, good service Precision casting Certification: ISO9001:2000 OEM/ODM service Helical gearsPrecision castingMaterials:stainless steel, carbon steel, cast iron, ... casting, investment casting, pressure casting, heat treatment, surface machiningTools: gear shaper, gear planer, high precision CNC maching centers and lathes.Types: helical gears, spur gears, bevel ...