Chuck the JMI 1/2" Wheeley Bar Leveling Screw Speed Dial into your drill and quickly level your wheeley bar, and thus your whole rig, to make setup faster and easier. To use, simply place the claws of the adapter over the leveling screw handle and set the drill on forward or reverse to achieve proper leveling. This version of the speed dial is designed for use with 1/2" leveling screws.