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Adapts a pinion gear with a 5.0mm bore to a 3.2mm (1/8") motor shaft.
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Is the inside of it a circle (the part that slides onto the motor shaft)
A:
If we understand your question correctly yes, the inside is a circle that fits on a 3.2mm shaft and the outer diameter is 5.0mm for 5.0mm bore pinions.
RCJuice answered on June 21, 2018