A DC connector for Icom, Kenwood or Yaesu transceivers - available in 4-pin or 6-pin to suit most transceivers. Includes metal contact pins for crimp/solder fitting.
These are ideal if you want to make up a custom length cable, perhaps for "portable" use where voltage-drop on a long cable (with a 12v leisure battery) may be a problem.
Just add red/black cable, eg: 12AWG and suitable fuse/s, eg: 25A automotive fuse+splash-proof carrier. This video (in Russian), shows an easy to follow method of how to build your own cable.
If you're not sure which type you need - just tell us what your radio is - or check via a Google Image Search...