Material: Made of brass, corrosion resistance and electrical conductivity, safe to use, and can be used for a long time. Versatility: Designed to fit all standard top of post batteries. They’re strong enough to withstand corrosion, tarnishing and general wear and tear without showing any signs of it. Widely used: Suitable for marine vessels, heavy trucks, trucks, automobiles, construction machinery, etc. The package includes: 8 positive poles + 8 negative top post marine battery terminals. Size: Both mounting bolt diameters are 5/16" diameter. positive pole: 19MM, negative pole: 17MM. QWORK