This replacement Plate Lock Lever from Manfrotto is compatible with a Manfrotto MHXPRO-3W 3-Way, Pan-and-Tilt Head; MHXPRO-2W 3-Way, Pan-and-Tilt Video Head; or MHXPRO-BHQ2 Ball Head. It is a cam lock that retains a quick release plate used with any of those heads.
A separately available T20 Torx screwdriver is required for installation.