ESI T-C5H Trigger-Style Aluminum Clamp with Big Wing This T-C5H Trigger Clamp is a 360 wrap around tube truss clamp designed to securely mount heavy fixtures to truss, now with the big knob for a more ergonomic feel. ESI offers a wide array of small to medium temporary roof solutions to suit all types of outdoor events! Custom temporary roof projects are a specialty of the ESI Engineering Department, which focuses on safety and stability of its designs. for 2" / 50mm Tube, Holds: 500 lbs. T-C5H Features: Big Knob for ease of use. TUV Rheinland Certified.