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XD-3420 DC Electric Motor, 12V High Speed Permanent Magnet DC Motor, Mini Electric Gear Motor, Low Noise, Low Loss, for Grinding Machine, Medical Equipment, Small Cutting Bench (12V 3000RPM) auspowers_batchfour You could distinguish their valueXD 3420 DC Electric Motor, 12V High Speed Permanent Magnet DC Motor, Mini Electric Gear Motor, Low Noise, Low Loss, for Grinding Machine, Medical Equipment, Small Cutting Bench (12V 3000RPM) Descriptions: This DC electric motor drives super smooth, almost no noise, safe to use. With high speed 3500 7000rpm for your choice and large torsion. Widely used in cotton candy machine, small cutting bench, grinding machine and other mechanical equipment.