Koolance HX-CU420V Radiator, 1x120mm 30-FPI Copper HX-CU420V is a low profile copper core radiator designed for one 120mm fan. With a fin density of 30 FPI (fins per inch), it offers best performance with higher air flow. It has a dual pass coolant design, and is G 1/4 BSPP (parallel) thread for hose fittings. 30mm (1.18") long mounting screws are included for 25mm thick fans (see Koolance radiator screw packs for additional options).