Molded from plastic and shaped like a pan or slab, they have a 1 inch lip that faces the tire and I'm sure it will hold up in mud and snow. my quad Those are big plastic rivets. It had no metal rivets, just screws and washers. I've used a few of these but the washers are oxidized black and will rust soon. The only positive is that I can reuse the numerous holes I drilled to install the next set. You can find them in a snowdrift in spring. Can be used in California as it is a free range organic plastic.
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