Backplate to extend cooler compatibility for AM5 motherboards from AMD Properties: The AM5 M4 backplate is an optional mounting plate that replaces the original AM5 backplate. Some CPu coolers use a mounting kit that comes with M4 threaded screws. These are not compatible with the uNC 6-32 thread used on the AM5 backplate. With the AM5 M4 backplate, appropriate CPu coolers, especially AiO watercoolers, can be used. Length: 104 mm Width: 65mm Height: 3 mm Material: Anodised aluminium