WIKIPEDIA Reference Used with 6' cords below: 2.1 x 5.5 mm DC Jack to 2 Pin Socket # 48-1021 2.5 x 5.5 mm DC Jack to 2 Pin Socket # 48-1025 2 Pin Plug to 2 Pin Socket # 48-1020 2 Pin Socket to 2 Pin Socket # 48-1202 Stripped & Tinned Ends to 2 Pin Socket # 48-1035 Battery Clips to 2 Pin Socket # 48-460 Spade Terminal to 2 Pin Socket And Assorted Plugs # 48-400 Similar To: Radio Shack 273-319, 273-0175