This auction is for one Female connector ( outer diameter 5.5 mm internal diameter 2.1 mm)
DC 5.5mm male to screw terminals connector
The easiest way to connect up your LED lights and all of your other power supplies that use this widely used plug and socket

LED s
CCTV
Routers
12v Power supplies

5.5 mm / 2.1 mm is the most common connection for most 12 volt power supplies
an excellent way to connect any device with a mail 5.5mm jack
Quick and easy , push the wires in the terminal block and tighten them up with a screw driver