DC 12V Fan features higher speeds longer life and less maintenance. Available in a variety of sizes to replace or upgrade DC fans in smaller electronic devices like your HDD rack or PC notebook. Improve air flow ， fit for PC CPU Cooler， Computer Case， and other matched radiator. Features: Brushless DC cooling fan Computer cooling fan to help pushing the hot air out of your computer when mounted on the back Rated Voltage : DC 12V External Material : Plastic 9 Blades Size : 6cm X 6cm X 1.5cm Mount Hole Diameter : 4.5mm Hole Distance (Center to Center) : 5cm Connector : 3pin Color : Black Package Content : 1 X 60mm x 15mm DC 12V 3Pin PC Computer CPU Cooler Cooling Fan (Note : Photo attached is for reference only， it may be slightly varied in items of colour， shape from the actual item delivered from time to time) We also carry cooling fan at size : 5cm， 8cm， 12cm