They were beams of 4 meters but after use the two beams were shortened to 3 meters. This falcon eyes extension set 3310c consists of two beams, each 3 meters long. The set is suitable for the b-3030c set, so you can easily expand your current ceiling rail system. Using these rails and a 3x3m set you can create the following setups: application the set 3320c consists of two beams, each three meters long, which you can attach to your track system to make it longer in length. If you want to attach the system to the ceiling, you can do so by using the optional 3330c set, which consists of four mounting plates (found under optional accessories). Note: the mounting plates are not supplied with the rails but must be ordered separately.