Size : 40x40x12mm +/- 0.5mm ; Material: Aluminum alloy. Connection : Can be connected to an inner diameter of 7-8mm Water pipe. Application: Use thermal paste to maximize heat transfer and dissipation.This block have a m-shaped inner flow pattern Uses: CPU GPU VGA RAM VRAM VRM IC LED MOSFET Transistor SC CPU, graphics gpu heat, motherboard, xbox consolesgraphics, semiconductors, industrial inverter driver, laser head cooling and other industrial control systems