The factory nuts on the new Ford F150 models have a thin non-removable metal cover. After being taken out several times by rotating the tires, they warped and no longer fit in the nest. Believe it or not, I had 2 dealers tell me my "nuts were swollen". For real? Ford's solution is to sell you a new set of nuts for $250! Union Nuts from DP Accessories are the perfect replacement at a very affordable price. They have been on my truck for a while and are holding up very well. I highly recommend them!