These clamps are used to support track systems from overhead structures when direct mounting is not available. Supporting media is provided by the installer/rigger and is not provided with the hanging clamp. Clamps are constructed of plated formed steel and are provided in 2 halves with assembly hardware. Recommended spacing: 4' with additional units in curves and stack areas. Pipe battens and pipe clamps (optional) are recommended for suspended curved tracks. Sold individually. Approximately: 1-1/4" wide x 1-3/16" long x 2-1/8" high.