I received the 3m command designer hook as a sample and after trying it, went out and bought more. I just redid my walk in closet and put a bookcase in the closet. I wanted to hang my swifter vac in the closet but didn't want to put a nail in the bookcase. I put this hook on the side of the bookcase and it was strong enough to hold my swifter. I then added two more hooks to add a couple of other items on the side of the.book case . These hooks kept items off the floor, looks nice and neat and I don't have to worry about damaging my bookcase.