It took me a while to figure out how to set the adjustment to the correct diameter so it would fit snugly on the rims. Once that was done, they snapped easily and firmly into place. They don't go away on their own at all. I recommend everyone to set them to the largest diameter that will allow them to snap onto your steel rims. In winter I use them for the second season and only on winter tires. They look better than regular steel rims.