... Surface:smooth Certification: ISO9001:2000 OEM/ODM service Spur gearMaterials: stainless steel, carbon steel, cast iron, copper, brass etc.. Or selected by ... helical gears, worm gear, rack and pinion, inner gear, ring gear, stainless steel gears...Process: precision casting, CNC precision casting, precision machining, surface ... and visit! precision casted and machined spur gear of stainless steel