There's a hook here for every need. From small hooks ideal for smaller items to larger hooks ideal for larger and heavier items, this set truly has a hook for every need throughout the house. Simply suction these to glass or any kind of porous surface and push. These are made of high quality plastic and have a clear suction back. Each one contains just one hook. Measurements are approximately: 1 1/2", 1 1/4" and 3/4".