I used them on my toilet and they work great.
Melissa, Thank you for your question. Yes, I personally have used these to shim a wobbly toilet and they work great.
cejoyce, thank you for your question. We do not have tested documentation for the weight capacity on these. This would be something we would have to go back to our manufacturer to receive. If you would like us to reach out to our manufacturer, please email us at email@example.com
They are pretty solid and capable of supporting a substantial weight.
It will work just like inserting any shim.
For the cost this is well worth trying. I suggest leaving a few inches behind the fridge. Then use the shims, pulling the fridge forward onto the shims. When you need to clean, move the fridge backwards a few inches off the shims. Then remove the shims so that you can move the fridge forward to clean.
I too need shims now and have a toilet (other brand which is not as good) that needs install today!...This name brand is better than the generic!