If you clean the barrels of your wheels, you know you can easily get cut up by dust shields. Using this saves time with 20" rim barrels and if you have massive calipers grab the smaller one too. Just be aware of the way you pull it out or it will splatter on your clothes.
works great. rubber nipple easily gets caught on spots near the caliper and the metal spine coating doesn't seem like it will hold up (if its even coated at all)