FEATURE:RC motor cooling fan is made of high quality aluminum alloy and plastic materials, durable and long service life. High performance and fine workmanship. DESIGN FOR:Suitable for Brushless Motors with a Diameter of 40-42mm / 1.6-1.7in (Such as: 4068 4074 4268 4274 Brushless Motor), Suitable for 1/8 Remote Control Car. REDUCE MOTOR HEAT:The upgraded components will greatly reduce the heating of the motor, convenient installation and disassembly, easy to use. GREAT HEAT DISSIPATION PERFORMANCE: It has a perfect heat dissipation effect, which can effectively prevent the motor from overheating. EASY TO USE:The cooling fan can be opened through the receiver for greater heat dissipation and to prevent engine overheating. Specification: Item Type:Dual Fan Motor Heatsink Material: Aluminum Alloy + Plastic Weight: Approx. 73g / 2.6oz Voltage: 8.4V Maximum Speed: 27000RPM Fan Size: Approx. 30x30mm / 1.2x1.2in Size: Approx. 60x46.5x43mm / 2.4x1.8x1.7in Application: Suitable for Brushless Motors with a Diameter of 40-42mm / 1.6-1.7in (Such as: 4068 4074 4268 4274 Brushless Motor), Suitable for 1/8 Remote Control Car How to Use: InstructionsforUse: Clampcoolingfandirectlyonthemotorandconnectittothereceiverforpowersupply.Donotusetoolargeortoosmallvoltage,whichmayresultinpoorheatdissipation. Package List: 1 x Dual Fan Motor Heatsink Note: 1. Since it is manual measurement, please allow an error of 13mm, thank you! 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. The motor is not included in the delivery.