POWERFUL GEAR DRIVE FOR MOTORS Introducing the Great Planes GPMG0500 Electrifly Gear Drive Unit, specifically designed for stick mounting 20mm ammo motors. VERSATILE COMPATIBILITY This gear drive is compatible with all 20mm Electrifly Ammo motors as well as most other 20mm in-runner brushless motors. INCLUDED GEAR RATIOS The GPMG0500 comes with two gear ratios: 5.1:1 and 6.4:1, offering options tailored to your specific performance needs. HIGH-QUALITY BUILD Engineered with high precision spur and pinion gears for quiet operation, it supports a dual ball-bearing output shaft for enhanced stability. COMPREHENSIVE ACCESSORIES Included components consist of various pinion gears (10T, 12T), a 64T spur gear, a prop saver style prop adapter, and all necessary assembly hardware. Experience the precision and durability of Great Planes gear drive systems, perfectly suited for your 20mm inrunner motors.