Manfrotto: MVA500AH, MVA500A, 500AH, 501HDV, 502AH, 503HDV, 504HD, 509HD, 701HDV, 577, MH054M0-Q5, MH055M0-Q5, MH055M8-Q5. For Manfrotto Compatible Video Heads. Length of plate: 220mm. High quality aluminum alloy is used to ensure a light weight but super high strength support.
eBay