Master battery cut-off switch terminals are now required to be insulated by many sanctioning bodies. Use these flexible boots to cover the terminals on your master switch or other electrical connections that use 3/8" studs (will also work for many other stud sizes). Designed to be used on our 4 gauge battery cable, just slip one on before terminating the ends. Snug fit on cable allows the boot to stay in place once fitted over the terminal end, still allowing them to be easily pulled back for maintenance. Available in Black or Red.