Hobby Wing Brushless Motor ESC Waterproof for 1/10 RC Crawler 1/14 Radio Truck. Motor Outer Diameter: 37mm. Motor Shaft Diameter: 3.175mm. Motor Shaft Outer Length: 16mm. BEC Output: 6V/7.4V, 6A. Applicable Battery: 2-3S Lipo Or 6-9 Cell NiMH. Suitable for: 1/10 RC Crawler Car 1/12 1/14 Remote Control Truck Model. 1PC 2 in 1 Brushless Motor ESC System. Please don’t open a dispute or return request if your products got any problems. International Buyers Please Notes.