509PLONG, the new extra long camera plate, suitable for all the latest Manfrotto Video Heads. This plate works together with the new ABR (Advanced Balancing Recorder) system, thanks to a special built-in index. Technical specifications: Attaches By 1/4" screw attachment type; Attachment (Top) 3/8" screw; Depth 1.96 in; Height 0.39 in; Length 5.51 in; Material aluminum; Weight 3.18 oz.