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Double Aluminum case worm gearbox (Ratio :72.6-317) Double NMRV worm gearbox;Double Aluminum case worm gearbox1) Made of high-quality aluminium alloy,light weight and non-rusting.2) Large output torque3) Smooth running and low noise4) High radiating efficiency.5) Good-looking appearance ,durable service life and small volume.6) Suitable for omnibearing installation.7) Ratio :72.6-317 Double ...