The BT7824 is an external joining kit for 50mm poles which is designed to extend the drop of System 2 installations. Made from a single piece of 4mm thick heavy duty steel the joiner easily bolts to the outside of the poles to create a rigid join. The open tube design allows cables to pass through unimpeded and also provides a cable access point at the join location.&lt;br /&gt;&lt;br /&gt;- Allows a rigid join of 2x 50mm Poles;&lt;br /&gt;- Heavy duty steel supports substantial loads with minimal movement;&lt;br /&gt;- Allows cables to pass through the poles and joiner;&lt;br /&gt;- Supplied with safety bolts for secure installation;&lt;br /&gt;- Includes grub screws which allow micro-adjustment of pole range;&lt;br /&gt;- Poles sold seperately.