Most importantly

Operating Voltage Range: 4

Alloy Steel construction

is worthy of the name of the principal British tank

Power Hobby - Power Hobby Heat Sink w/ Twin Tornado High Speed Fans, for 1/8 Motors, Blue ASC40007C Most importantlyHeat Sink features a lightweight aluminum construction with a dual cooling fan design. The heat sink is compatible with 1 8 scale motors around 40. 8mm diameter and 57. 9mm in length and includes two 30x30x10mm high speed fans that peak around 18,000RPM @6v The fans can be installed directly to the heatsink or you can use the included 10mm spacers between the fans and the heatsink for enhanced airflow. Features: Fits 1 8 motors with 40. 8mm diameter