Great Planes Set Screw Propeller Adapter 5.0mm Input to 5/16x24 Output FEATURES: Mounts onto the shaft coming out of a gearbox or motor with the included set screw; The propeller mounts onto this with the included nut Alu INCLUDES: One Prop Drive One 3.5x5mm Set Screw One 5/16 Propeller Nut REQUIRES: Installation onto the motor or gearbox shaft