These 2.1mm DC female jack sockets have a 2.1mm DC socket on one end and a screw terminal block on the other. You only have to screw your cable into the back with no splicing or crimping and plug in.
The terminals are marked with positive and negative terminals to avoid confusion.
Image shows 2 items to show both ends of product. Only one will be supplied.
Sold individually so only buy what you require.
Contents of Package
1 x 2.1mm DC female jack socket