3003 HD-Series Battery Switch Selector with Alternator Field Disconnect  Features: * 500 Ampere Continuous Rating * Accepts 4/0 battery cables * Ignition protected - safe for installation aboard gasoline powered boats * .870' (22.01mm) stud length to accept 4 or more cable terminals * 1/2' (M12) Tin-plated copper studs for maximum conductivity and corrosion resistance * Meets American Boat and Yacht Council (ABYC) requirements for battery switches * Tactile textures indicate knob position by feel only * Case design allows surface or rear panel mounting * Fits all Perko and Guest low amperage battery switch hole patterns Warning [https://productimageserver.com/prop65/6pt.png]WARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov [http://P65Warnings.ca.gov].