A lot of lug nuts do in fact have a cheap/thin, probably aluminum cover on them. It's decorative and solid lug nuts are available at auto parts stores, but they do cost more. If the incorrect lug wrench is used such as a 4-way, you can easily damage the protective cap. Get a decicated thin wall socket for your lug nuts and replace the damaged one.
2017 F350 Dually 6.7 Diesel
2014 Silhouette 299 RKDS
Nights Camped 2016 - 43
He who dies with the most tools, wins!