Morris Products 14901 EMT Set Screw Coupling, Steel, 3/4" Trade Size (Pack of 25) EMT Set Screw Couplings - Steel - EMT Set Screw Couplings are Used To Secure EMT Conduit to EMT Conduit. Use to connect EMT Conduit to EMT Conduit Concrete Tight (When Taped) Pre-Set/Pre-Staked Combo Head Set-Screws Heavy Steel Walls