All connectors are center positive.
The connector size is the standard 5.5mm Outside Diameter and 2.1mm Inside Diameter.
Check the size of your connector as some equipment uses a smaller one.
We have bundles of 1 pcs to 100 pcs.
The more you buy the cheaper it is each.
We have posting for 5V, 6V, 9V and 24V power supplies in the same casings.
In metal casings we have in 5V, 12V, 24V and 48V up to 70A.
Free shipping in the US.
7% Sales tax to items shipped to a Florida address.