The Frank Wall LM2 is a Liner Mule Tool. This tool is designed to be used by a professional pool service personnel. The Liner mule is an amazing simple tool that hooks the liner bead of a liner that has slipped out of the track and helps pull the liner bead straight up with the bead pointing toward the track for easy re-insertion of the bead. This tool will make the users job on the work site much easier. With this easy tool all of the difficulties of a slipped liner have gone away.