Review on High-Quality 10-Piece RJ45 Coupler: Ethernet Extension Adapter for Cat7/Cat6/Cat5e/Cat5 Network Cables - Female to Female (Black) by Jim Raju

I needed about 10 extra feet in a Cat 5 run after remodeling my home office and at any one time there were half a dozen short cords in an old backpack, so I added Connect using the cables with those plugs was the quickest and cheapest way to get started again. I probably should have gone with a smaller package because I have 8 spares now, but I think I can make longer cables now.