This is a replacement spur gear with integrated shaft for the GD-600 Electric Flight 2.5:1 ratio gear drive unit. This goes inside the gear drive unit. The motor pinion goes against the spur gear and the prop drive mounts onto the shaft.
Features: Black nylon spur gear comes premounted onto the metal shaft
Includes: One Replacement Spur Gear with integrated Shaft
Requires: Assembly onto a GD-600 gearbox
Shaft Diameter: 4.9mm