... Price Brass small worms gears factory,worm screw Features:1) name:cnc worm,cnc worm gear,cnc worm wheel2) material:brass, copper ,steel, ... machinery parts.metal10.HistoryEstablished in 2000,12 years manufacture experiences1,Worm gears are used when large gear reductions are needed. It ... spin it, the friction between the gear and the worm holds the worm in place.3,This feature is useful for machines ...