The exterior spring of the flexible extension leads the single ball joints. The more flexible extension is twisted, the higher is the power transmission, by hooking of the ball joints into each other. By the 3/8" extension ball joints can be removed individually. In contrast to the regular extensions, with only spring and low torque, which tears by heavy use, the Exten-Flex can bear up to 350 NM!
Recommended for extremely hard to reach fittings combined with high torque values