54 Set screw connector of trade size 2-1/2-inches, is perfect for grounding and securing EMT raceways to boxes and enclosures. It features zinc-plated steel construction. Concrete-tight connector comes with 3-Way combination screws. It measures 3.1-Inch Dia x 3.18-Inch. It offers set screw to male hub threads NPS connection. Connector is UL/cULus listed.