Skimlite 9000 9024 8-24' Dual Cam Series Telescopic Pole 3-piece. The Dually was created when we realized there was a demand to make a hybrid out of the 5000 series internal/external locking mechanisms. With this pole you can lock both external and internal locks for more locking power on jobs that demand the most. You also have the option to only use one of the locks for quicker and lighter jobs.