The Flex Flyer from Rack-a-Tiers features a quick change swivel head that installs on the end of a fish tape in 20 seconds by twisting the fish tape with 2 pairs of pliers. The loop technology allows the leader to move smoothly through all types of conduit including flex. The standard 1/4″ – 28 threads allow for other types of leaders to be attached to the quick change base.