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We've been using the Large size for our back porch steps and the rubberized surface gives excellent grip even when it's wet out. It sits perfectly flush and doesn't budge at all.

We ordered the XL size for the side door, and it handles our heavy lawn mower without any wobble. The rubber grip on the bottom keeps it firmly in place even on damp concrete.

Got the Large version for our back porch step and it handles our heavy mower cart without a wobble. The rubberized surface gives good grip even when it's damp out. Exactly what we needed for that awkward 6-inch rise.