Sigma's Steel EMT Set Screw Couplings are used to connect two lengths of steel EMT conduit in dry locations. These zinc-plated steel couplings are approved for concrete-tight applications when taped. Set screw type couplings securely connect two lengths of 3/4-in steel EMT conduit Approved for concrete-tight applications when taped Additional Details ------------------------------ Product description: Sigma's Steel EMT Set Screw Couplings are used to connect two lengths of steel EMT conduit in dry locations. These zinc-plated steel couplings are approved for concrete-tight applications when taped. Set screw type couplings securely connect two lengths of 3/4-in steel EMT conduit Approved for concrete-tight applications when taped Material: steel