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To compliment our Scorpion HK series Helicopter motors, we are now offering Pinion Gears in the popular Mod .5 size that are used with most 400, 450 and 480 class electric helicopters. These pinions are designed to fit any motor with a 3.175mm shaft (1/8 inch), and come with an allen key set screw.This package includes 4 different pinion gears, one 10-Tooth pinion gear, one 11-Tooth pinion gear, one 12-Tooth pinion gear, one 13-Tooth pinion gear and four set screws. This convienient assortment pack allows you to try different gear ratios in your helicopter to find the best performance!