The Manfrotto MF 400PL is produced to be a standard Medium Plate. The Manfrotto 400PL can be easily used with a 400 geared head.
As well as the standard quick release plates, Manfrotto also make Architectural and Hexagonal plates for still cameras. Architectural plates feature a raised edge to stop your camera from rotating on the plate, and hexagonal plates are ideal for larger cameras. The MF 400PL is a plate for 400 geared head. MF400PL is a medium version for additional clearance.
The MF 400-PL med plate comes with both 3/8 in and 1/4 in screws. The Manfrotto 400PL is similar to: 400PL-LOW and 400PL-HIG