Full 360° selection and tough polycarbonate case provides years of reliable service. Rated at 230 amps continuous, 345 amps momentary. Measures 5-1/2" dia. x 2-5/8" deep. Selector switches allow selection of either battery, both batteries in parallel, or complete disconnect of both batteries. On/Off switch permits battery to be shut off near source. Cable lug size: 3/8".