O-Clamp 12 Pack DJ Lighting Clamp to Mount Light to 1.5" - 2" Trussing and Pipe Money Saving Package Deal on an O-Clamp package 360 degree wrap around tube truss clamp- securely mounts fixtures to truss Non scuffing - Non scratching - Non scoring - Non denting Fits 2 sizes of DJ Trussing: 1.5 inch and 2 inch An Adapter is included to convert the O-Clamp from a 1.5" O-Clamp to a 2" O-Clamp.