Koolance HX-360XC Radiator, 3x120mm Fans, 54mm Thick, 30-FPI Copper HX-360XC is an extra thick (54mm, 2.1in) copper core radiator with a fin density of 30 FPI (fins per inch). It offers greatest performance when sandwiched between multiple high speed 120mm fans. 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 on one side only (see Koolance radiator screw packs for additional options).