Topaz’s Duplex Connector for BX-FLEX, NM and MC cables feature a one set screw type assembly for use in interior, dry locations to securely connect flexible metal conduit or armored cable to a box or enclosure. Fabricated from corrosion resistant and dependable zinc die cast; 3/8” size with 1/2” knockout. Fits aluminum smooth extruded MC, range .210 to .500; NPT male hub. UL listed.