1、Durable Material: The propeller is made of premium plastic plus aluminum alloy material, durable, resistant to wear and tear, high strength, and more exquisite appearance. 2、High Speed Bearings: Smooth and neat surface, DIY good sailing environment, good performance, able to go forward and backward. 0.2in steel drive shaft, sleeve with 2 high speed bearings, so that the shaft runs smoothly, spiral pulp drive. 3、Easy to Maintain: RC boat thruster is reliable use, using tooth wheel drive, anti slip nut fastening, to ensure that the spiral pulp work stable, easy to maintain. 4、Sturdy Structure: The structure is sturdy, which makes the boat more flexible and is very suitable for pushing the boat strongly by reducing the influence of natural water flow. 5、Applicable Objects: With 540 brushless motor and heat sink tube, it is suitable for various model boats and RC boat modifications, and can propel about 17.6 ~ 22lb hull. Item Type: RC Boat Thruster Thruster material: Plastic, aluminum, copper Color: Gray, dark blue Thruster size: Approx. 150 x 43mm / 5.9 x 1.7in Thruster aperture: Approx. 26mm / 1in Thruster hole diameter: Approx. 3.175mm / 0.1in KV(RPM / volt): F540-4370KV Power: 820W Maximum voltage: <12V Maximum current: 66A Maximum speed: 50,000 Length: Approx. 50mm / 2in (without shaft)Diameter: Approx. 36mm / 1.4in Shaft length: Approx. 15mm / 0.6in Shaft diameter: Approx. 3.175mm / 0.1in Connector: Approx. 4mm / 0.2in banana headPropulsion: Approx. 17.6 ~ 22lb hull Suitable for all kinds of model boats and RC boat conversion 1 x Set of 26mm Thruster (13 Accessories in Total) 1 x Motor Mount 1 x 540 Brushless Motor 1 x Heat Sink Tube 1 x Rubber Hose 30 x Screws 1 x Nut 2 x Instruction Manuals