iPEGTOP Rotate Lock Vacuum Suction Cups for Bath Shelf Shower Caddies, Two Suction Cup

Suction cup works on ceramic tile, glacss, mirror, granite, stainless steel, acrylic, laminate and any non-porous surface with glossy finish, Suction will not work over grout lines (diameter of suction cup: 7cm/2.8in) or on porous surfaces such as: WOOD, unfinished MARBLE, GRANITE, porcelain, wallpaper, natural stones (such as Travertines), painted wall & any surface that is bumpy, etc., No screws, no nails, no glue, no tools, Can be re-positioned many times over and removed without leaving residues ., Adhesive on back helps to fix the position better, 2 suction cups included., For second use, please wash and dry the black rubber before installation.