I got my first set of these because I have a very heavy computer (about 45 pounds). Occurrence. The installation took only five minutes, I was satisfied. I have ordered 3 more sets! Once you start putting things on wheels you realize how easy it is to move things and make your woman happy, who always wants to move what she told you to take to a new place. I ended up putting her on a bookshelf that I thought she might want to move. BINGO. She wanted it postponed a week after she told me where she was going. Rather than offloading the bookcase, moving it around, and then putting everything back, I just unlocked the wheels and moved it, locked the wheels, and you're done. Now I'm walking around the house and seeing what else I can attach to these little wheels. . I like her!