This Micro Battery Switch features a removable knob for extra security. To remove, simply twist the cap to the OUT position and pull. Mini footprint makes it ideal for close quarters. The 422732-1 is rated at 100A continuous and 150A cranking amps. Installation is as easy as drilling a 1-1/8" hole, inserting the socket body, tightening the locking nut, and connecting the wires. Constructed of machined brass and injection molded nylon.