I'm not sure I would put them in the heavy duty category as they are plastic but they are hard plastic. However, for what I bought them for, they worked great. He moved our washing machine and with my distress pushed it into the front panel. No creases but it has been dented for weeks and the spin cycle has worked every time but not enough to pop it out again. I didn't have a magnet strong enough to pull it out, so I used these. Ideal. Just grab one, stick it to the front of the washing machine, lock it in place with one simple movement. The dent is gone, I can't even tell what it was.
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