Steel City® Strut Clamp (Heavy Strut Strap), 2-1/2 in, Zinc Plated Steel, Pre-Assembled with Bolt and Nut, For Use With EMT, IMC, and GRC (Rigid) Conduit, Compatible With 1-5/8 in x 1-5/8 in Strut Channel. Secures 2-1/2 in conduit to strut in heavy-duty suspended systems and industrial rack installations.