This sale is for a battery isolation switch for golf carts.   A 1/4 turn of the knob shuts off all current and isolates batteries from the electrical system of your cart.  Only one switch is needed.  Very easy to install.  You can locate the switch on any one of your batteries to isolate all of your batteries.    Place it where ever it is convenient  .  It can be placed on a positive or a negative post.  The switch is a convenient way to prevent unauthorized use, theft, or battery drain.  For theft prevention you can unscrew the black knob all the way and take it with you.  If you are a snowbird and leave your cart unused for several months this switch is perfect to prevent  battery drain if there is any electrical draw.  One end of the switch has an non-threaded hole that goes over the threaded battery post.  The other end is threaded and a bolt is supplied to connect the cable eyelet that was removed from the battery.  The switch is made in the USA.   Your satisfaction is 100% guaranteed or your money is quickly and cheerfully refunded.  I intend to please everyone.   Bruce in Joliet, Illinois