Ninth-City 4 Holes Car Truck Boat Battery Disconnect Isolator Cut Off Power Kill Switch 60V/300A Battery kill switch1/4" x 3/4" Studs.Two 3/16" Mounting Holes. 1 pc Removable Keys included.5/16" Brass Terminals. Battery cut-off switch boat solid Brass Nut and Washer. Theft deterrent and fire protection. Extend the life of your Vehicle's battery.