This replacement Top Plate from Manfrotto is compatible with a Manfrotto MHXPRO-BHQ2 Ball Head. When connected to the head's ball-and-socket joint, it serves as a platform for a compatible quick release plate. A countersunk screw with a 4mm hex screw drive is included to attach the plate the the ball head.
A separately available 4mm hex key is required for installation. To provide the ability to lock a compatible quick release plate to this top plate, a separately available R103807 Replacement Plate Lock Lever and R103808 Replacement Safety Assembly are required.