Knife-Switch Top Post Stud Battery Disconnect - This battery disconnect is easy to install and simple to use. Just mount on negative terminal and flip the switch to quickly diconnect your battery. It is recommended to mount this switch on the negative battery post, which makes it easy to reach and operate. It has a 5/8 inch in diameter post, plus 5/16 inch -18 thread stud and wing nut for accommodating a variety of versatile wire leads and extra connections. Carries 250 Amps continuous and a maximum surge of 750 Amps at 12 Volts. Dimensions: 3 inch W x 4 inch L x 2-1/4 inch H. 1 per package.