This baseplate is designed specifically for the Sony PMW-F5 and PMW-F55. The camera is mounted to the baseplate via one 1/4-20 and one 3/8-16 captive screw. There are many positions available for these mounting screws to allow you to position the baseplate fore or aft on your camera to achieve perfect balance. The camera mounting screws both have the same hex head size so just one 5/32 hex key is required to mount your camera. Six rubber pads grip the the bottom of the camera firmly to ensure the camera does not twist on the baseplate. This version includes one 15 mm Accessory Mount Block per side to allow the user to create cages, add side handles, or add accessories to either side of the camera. Lens center to iris rod center distance is 85 mm allowing the use of all matte boxes. There are two spring loaded indexable knobs per side on this baseplate. Using two knobs per side gives superior clamping strength to prevent the iris rods from rotating. The bottom of the baseplate is drilled and tapped with the 17.25 mm offset holes required for use with an Arri bridge plate. The baseplate weighs one pound 2.75 ounces or 535 grams. Length is 6.400 inches, width is 4.500 inches