... mining machinery factory. Such as spur gear, bevel gear,sprial bevel gear,internal gear,sprocket,transmission,reducer,shaft and ... 0ProductsAll kinds of gears (spur gear, bevel gear, sprial gear, ring gear, internal gear, sprocket, chain wheel) transmission, gear box, reducer ,shaft ... high precision on teeth of gear.CertificateISO9001:2000Minimum quantityAccept trial order small standard spur gear