No-load Speed: 21RPM, 35RPM, 42RPM, 70RPM, 105RPM, 140RPM, 210RPM, 280RPM, 420RPM. NMRV30 NMRV40 Worm Gear Reducer Gear Box Motor Micro DC 12V 24V 60W Gearmotors. S pecification: Worm Gear Speed Reducer Gearbox Model: NMRV30 / NMRV40.
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