ProX T-CH17 360 Degree Rotating Clamp with 180 Degree Half ConicalProX T CH17 Pro Clamp W Adjustable 360 degree and 180 degree Half Conical Connector For Single Tube Trussing. The ProX T CH17 Pro Clamp w Half Conical Connector For Single Tube Trussing allows you to add some single tube trussing or create a new connection point to the angle you desire. It can be set from 0 to 180 degrees giving you versatility and pleanty of truss clamping options. Each clamp is made of heavy duty cast aluminum for long life, great