Andoer RCX 1804 2400KV Brushless Motor CCW Thread for DJI F330 ZMR250 H250 Quadcopter Part 1804 2400KV Micro Size Outrunner Brushless Motor Designed for Multicopter This is a great little motor suitable for multirotor helicopters size between 200-330mm. Motor Diameter: Approx. 23.6mm Motor Shaft Diameter: 5mm Includes 1 spinner (5mm diameter) and 4 M2x5 phillips mounting screws