The Bridgeport 4057-DC Transition Coupling is a die-cast zinc fitting designed to connect 3/4-inch EMT conduit to 3/8-inch flexible metal conduit (FMC), armored cable (AC), or metal-clad (MC) cable using a set screw installation. With a ball burnished finish, it measures 1.19 inches in diameter and 2.12 inches in length, ensuring a secure and durable connection. UL 514B, ETL (Canada and US), and CSA C22.2 approved, this fitting meets Federal Specification A-A-50553 and NEMA FB-1 standards for high-performance electrical installations. RoHS and TCLP compliant, it provides a reliable transition for various conduit and cable systems.