American DJ O-Clamp 1.0
Comes in 3 sizes: O-Clamp 1: Fits 1-inch Truss when using the supplied adapter O-Clamp 1.5: Fits 1.5-inch Truss when using the supplied adapter O-Clamp 2: Fits 2-inch Truss when the supplied adapter is removed from the O-Clamp 1 or O-Clamp 1.5