So I have to admit the suckers do not last very long. To fix something, or to work with heavy loads can be sure not recommend. But for that they are, I think, not think so. Hold quite well for a short time, then fall but after 5 minutes of inactivity. I have added myself to repair my Mac. Thus one trembles from the front window of the Mac, to get to the innards. For me, the little suckers have proven good service.