The flex flyer 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. Features: installs in under 20 seconds using two pairs of pliers, no torch needed. Loop technology allows leader to glide through all types of conduit as well as flex.Loops allow leader to be snagged from the other end of the conduit end when necessary. Standard 1/4 - 28 threads allow other types of leaders to be used on the quick change base.