Manfrotto 577 Rapid Connect Quick Release Adapter with TWO 501PL Sliding Mounting Plates. Never used! Mint new condition in original packaging. Meet in public location. $50 cash
Solid metal quick release plate allows you to quickly transfer your camera from tripod to slider to gimbal to jib, when they all have the same mounting plate. Works with 501PL, 501PLONG, 504PLONG, 504P Long, 502HD.