This end cap is slid over the end of the tube. The eye on the cap can serve as a brace connection, but also for a wire connection. This screw cap is available for tube diameters of 42 and 60 millimeters and in various RAL colors: aluminum, aluminum RAL 9005 black, aluminum RAL 6005 green, aluminum RAL 7016 gray and aluminum RAL 6009 green.