... internal gear, sprocket, chain wheel) transmission, gear box, reducer ,shaft and sleeve etc.ApplicationSuitable for various light vehicle transmissions, auto ... steel , aluminum alloy , zinc alloy , brass , gray iron , nodular cast iron , ductile iron specifiedModuleNormal modal is between 1.5~10Out ... of gear.CertificateISO9001:2000Minimum quantityAccept trial order right hand worm shaft and worm wheel