Pair +/- Boat Battery Cable Wire Post Terminal Connector Clamp Positive Negative This is a set of high-quality marine grade 12 volt battery terminals. The black negative terminal is 5/16" (8mm) and the red positive terminal is 3/8" (10mm). Insulated color coded wing nuts make it easy to attach power wires. The pictures are of the actual item and were taken by us so you can see exactly what you are getting. Save $$$ compared to your local marina. Your satisfaction is 100% guaranteed! Shipping is FREE everywhere in the United States. For international shipping not listed contact us for a shipping quote before placing your order. Thanks again for looking and as always your business is appreciated!