3 Tiers Fits under bathroom or kitchen sink, and around pipes * Twelve Snap on Plastic Grids about 11 1/2 inches overall size or Ribs are like open bins, see second picture * Six fixed tubes are made of Anodized aluminum * Adjustable shelves and has 3 hooks to hang brushes, towels etc. * No tools necessary and assembles in minutes. Size: 15 ½ tall x 15 ½ wide x 12 inches deep