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This pinion gear is specificity designed for our HK4035 series helicopter motors, with the size of module 1.0 and the bore size of 6.0mm that are used with the most 700 class electric helicopters and are made with harden steel. These pinions are perfectly fit for our HK4035 series.
This package includes one 12-Tooth pinion gear and one set screw (by 4x5mm).