Aluminum Pro M10 Truss Clamp with Hinge Adjustable 180 Degree Half Coupler

Discontinued and Replaced with 
T-CH17
http://www. proxdirect. com/products/view/2240

ProX T-C16H Aluminum Hook Style Clamp with Big Wing Knob for 2 Truss Tube Capacity 45 Lbs.  This Hook & Trigger Clamp is a versatile and reliable solution for mounting professional lighting fixtures to truss chords or other 2 OD pipes or tubes. One of the key features of this clamp is its hook design, which allows it to support the weight of your equipment during the mounting process...
https://www.proxdirect.com/products/view/2114