The RAP-B-366-153-354-TRA1 consists of a Track Ball base, composite double socket arm, and a 1" ball connected to a round plate with 1/4"-20 camera thread. This steel camera thread will connect to any standard female thread found on camcorders, digital cameras and POV cameras. This kit is compatible with virtually any track system including the RAM Tough-Track. T-Bolt Dimensions: .48" x .95"