ESI T-C8 Pro Clamp with Applied Eyebolt This T-C8 Pro Clamp with Eyebolt Applied is a 360 wrap-around tube truss clamp designed to securely mount heavy fixtures to truss. 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.