WM0 Pool Wide Mouth Skimmer Repair Kit Repair Kit for rust on the swimming pool wall at the wide mouth skimmer opening Matches size of Hayward 1091WM skimmer and Hydrotools 8939 Installs between existing pool wall and pool liner Includes installation diagram, industrial-grade TiN-coated Hi Speed Steel drill bit and 16 sets of stainless screws, washers, and nuts for assembly