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37D Spur gearbox used for 520/3530/555 motors, gear ratio can be 10,19, 30, 56, 90, 131, 168, 270, 506, 810
All material is made of metal.
Gear ratio 810 ( if you need others gear ratio, please contact us )
37D
Shaft : 6D * 22L, D-shaped
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