54 Insulated set screw connector of trade size 4-inches, is perfect for grounding and securing EMT raceways to boxes and enclosures. It features zinc-plated steel construction. This concrete-tight connector comes with 3-Way combination screws. It measures 4.74-Inch Dia x 4.87-Inch. It offers set screw to male hub threads NPS connection. Connector is UL/cULus listed.