Product details:

Locking Battery Selector Switch with Lock for use with 2 or more batteries and single or dual engine systems. They permit selection between batteries for starting and charging or operation of both batteries in parallel. for use with systems under 50-Volt. capacity 250 Amp continuous, 360 Amp Intermittent. 5-1/2 in. Dia., 2-5/8 in. depth. Use 2 switches for dual engine systems.