Steel City® Set-Screw Connector, Non-Insulated, 2-1/2 in Trade Size, Zinc Plated Steel, For Use With EMT Conduit, Concrete Tight When Taped, UL Listed E-16592, CSA Certified. Heavy-duty single set screw secures 2-1/2 in EMT to boxes and enclosures; field-removable for future changes.