Feature:1. PREMIUM MATERIAL: RC motor heatsink is made of premium aluminium alloy and plastic materials for durability and long life.2. HIGH HEAT DISSIPATION CAPACITY: RC motor cooling fan with double fan cooling capability for longer use of the RC motor.3. TEMPERATURE CONTROL: RC motor heatsink controls the temperature to prevent the engine from overheating, allowing the unit to run efficiently.4. UPGRADED DESIGN: RC car motor heatsink uses upgraded components that will greatly reduce the heat generated by the motor. Easy to install and remove, easy to use.5. HIGH SPEED ROTATION: RC car motor cooling fan is designed with strong air and high speed to effectively reduce the motor running temperature.6. PRACTICAL AND EFFECTIVE: RC motor cooling fan with high performance, fine workmanship and the possibility of using a cooling fan to guard your motor.Specification:Item Type: RC Motor HeatsinkMaterial: Aluminium Alloy, PlasticSize: Approx. 57x50x40mm / 2.24x1.97x1.57in Size: Approx. 40x40x10mm / 1.57x1.57x0.39in Working Voltage: DC 5VApplicable: For 42mm/1.65in Diameter Motors (e.g. 4268 4274) etc..Package List:1 x RC Motor Heatsink Note:Please allow for some errors in manual measurements.