... kinds of gears (spur gear, bevel gear, sprial gear, ring gear, internal gear, sprocket, chain wheel) transmission, gear box, reducer ,shaft and ... alloy steel , stainless steel , aluminum alloy , zinc alloy , brass , gray iron , nodular cast iron , ductile iron specifiedModuleNormal modal ... performance of transimission!Manufacture: Dingzhou Jiayu Gear Manufacturing Co.,Ltd. spiroid worm gear