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Topaz’s corrosion resistant Combination Couplings maintain fixed position for EMT to BX or NM cable; set screw to clamp type design ensures a secure connection. Recommended for indoor use. Rugged, corrosion resistant zinc die cast construction; trade sizes of 1/2" - 3/8” available; built to last and dependable. 2 screw assembly; UL listed, always in stock and ready for fast delivery.