3/4" (19mm) Strut Channel Socket 1/2" Drive for 2-7/16" or 3-1/4" Deep Channel 4-1/4" Overall Length Compatible with all 1-5/8", 2-7/16", and 3-1/4" channels and Strut For use with All 1-5/8", 2-7/16" & 3-1/4" Tall channels and Strut Zinc Plated Finish Impact Rated