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Scorpion 12-Tooth, 3.17mm, MOD 0.6, Helical Cut Pinion
This pinion gear is designed to fit the newest versions of the Trex 450 helicopter that come equipped with a MOD 0.6 helical cut main gear. The pinion has a 3.17mm center hole that is designed to fit the Scorpion HK-22mm motors, or any other helicopter motor that is equipped with a 3.17mm shaft. The pinion gear is made from hardened aluminum, and comes complete with a set screw for attaching it to your motor shaft.