Convert common post-style automotive batteries for use in marine applications Negative terminal: 5/16"; Positive terminal: 3/8" Accepts battery post from 1/2" through 3/4" diameter Brass-plated steel wing nuts Zinc-plated steel fasteners Cast lead clamps with low-carbon steel inserts Does not accept side-mount type battery with OEM cables (requires post adapters). Clamp dimensions: 1-1/8" W x 2-1/4" L x 5/8" H Weight: 0.75 lbs. (pair)