Halex 75803B Duplex Hit Lock Non Metallic Cable Connectors Nylon (25 Piece), 3/8" 3/8-inch's long (1/2-inch's long knockout) Fits 2 cables #14/2 or 12/2; 1 cable #14/2 and 1 cable #12/2; 1 cable #14/2 and 1 cable #10/2;1 cable #12/2 and 1 cable #10/2 Design allows for quick and easy two-step installation, push into box and insert cable; to ul and csa requirements Snap-in style means no screws and locknuts requires 25 pieces per box