EMT Set Screw Couplings 4" - Zinc Die Cast - EMT Set Screw Couplings are Used To Secure EMT Conduit to EMT Conduit.EMT Set Screw Couplings - Zinc Die Cast 4" features include: Use to connect EMT Conduit to EMT Conduit Concrete Tight (When Taped) Pre-Set/Pre-Staked Combo Head Set-Screws Die Cast Zinc Also UL Listed for use with Rigid IMC Uses 4 Set Screws UL/CSA Listed Order Qty of 1 = 1 Piece Below is more info on our EMT Set Screw Couplings - Zinc Die Cast 4"