These hooks are NOT reliable suction cups of other suction cups. They do NOT hold 20 pounds. I cleaned the surface of the wall tiles very well and treated them with alcohol according to the instructions. But these hooks still don't hold 6 pounds (two medium sized shampoo bottles and a razor)! At first glance it seems very durable, but after 24 hours my shower stall fell into the bath. Tried repeatedly. It's not worth it. These are plastic hooks that look like metal and I've seen the same ones advertised elsewhere that said they only hold 2lbs. I think all these small holdings over a period of time.
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