This is the Great Planes ElectriFly 8.0mm to 3/8-24 <br> Prop Adapter with Set Screw and Propeller Nut. <br> <br>FEATURES: Mounts onto the shaft coming out of the gearbox or motor with the <br> included set screw. The propeller mounts onto this with the <br> included nut. <br> Aluminum prop drive <br> Metal hardware <br> One year quality guarantee. <br> Compatible with any electric flight motor with a 8mm diameter shaft <br> <br>INCLUDES: One Replacement Prop Drive <br> One 5/64"X4mm Set Screw <br> One 9/16 (14mm) Propeller Nut <br> <br>REQUIRES: Installation onto the motor or gearbox shaft. <br> <br>SPECS: Length: 1.86" (47.29mm) end to end <br> 1.09" (27.6mm) complete shaft w/.96" (24.4mm) threaded <br> portion. <br> Diameter: 3/8" (9.5mm) prop shaft <br> .31" (8mm) ID for motor shaft <br> 1.4" (35mm) largest part of hub (thrust washer portion) <br> .62" (15.8mm) smallest part of hub