Converts 400 mm vertical pattern to 600 mm vertical pattern with M8 screws, no offset. FHB3XXX, FHB5XXX and FHB7XXX Includes screws and spacers specific to the TV being installed Some FHB products include special brackets to ensure a specific TV can be installed on Chief mounts FHBU medium and large Fusion and FHBU2 ExtraLarge Fusion are replacement universal hardware bags