The G.R.I. Armored Cable Extensions with Connectors were designed for use with the G.R.I. Pull Apart switch sets, but can be used with a variety of our industrial and overhead contacts.For applications where a longer cable run is necessary, the 25' extensions offer a clean and simple solution. The G.R.I. 8235-3 and 8231-3 together make a complete security loop with armored cable.