AM4 CPU heat sink bracket.For am4 motherboard and clip-on cooler .The pin has a small hole corresponding to the main board, which is firm and practical.90x54mm mounting hole distance with 4 screws.AMD CPU Fan Bracket Base for AM4(Motherboard chipset B350, X370, A320, X470, B550, X570, A420 and A520).For hook-type air-cooled or partially water-cooled radiators (B1220/B240).