This is the Great Planes ElectriFly 20mm Ammo Gear Drive. / The motor attaches to the mount and the prop attaches to the gear drive. / / FEATURES: For 20mm Ammo Motors and most other 20mm In-runner motors / High-precision spur and pinion gear for quiet operation / Dual ball bearing-supported output shaft / Standard 10x10mm stick mounting system / / INCLUDES: One gear drive / All assembly hardware / Prop saver / Two different pinion gear ratios 10T and 12T / 64T spur gear / Prop saver style prop adapter / / REQUIRES: Attaching to the motor shaft / / SPECS: Length: 1.84" (46.7mm) / Width: 1.66" (41mm) / Weight: .42oz (12g) / Motor output shaft dimension: 2mm / Prop adapter shaft dimension: 3mm / Gear ratios included: 5.3:1 and 6.4:1 / 5.3:1 with 12T pinion and 64T spur / 6.4:1 with 10T pinion and 64T spur / / rmb 12-21-06 / ir/jxs