In 1959 the 5008 was created and was the first telescopic pole ever made for the pool industry. Customers love the simplicity of this external locking pole and its heavy wall tubing. Our 5009 with its internal lock uses the same tubing for its great strength. Both style poles are among the pool industry favorites, it just a matter of preference on external or internal locking assemblies. Today we have eight poles in the 5000 Series family to choose from.