Movo Photo CTS500 Panaramic 180-degree Circular Sliding Track with Roller Bearing Sliding Platform (51" Length) 51" Circular Track (1/2 circle) Smooth Slides with Rigs up to 20 LBS Solid Aluminum Construction Works with 1/4" or 3/8" Threads Includes Roller Bearing Platform, Adjustable Legs, Stoppers & Carrying Case