12mm Full Metal Gear Gearbox Speed Reduction Reducer for DIY N20 N30 Motor

Suitable For N20/N30 Motor and 15BY Step Motor. -Speed Ratio(1:00): 10:1, 30:1, 50:1, 100:1, 298:1. -Size(L W H): 12 10 9mm. -Output Shaft Length: 10mm.

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