The Eastwood Fender Roller is constructed of heavy-gauge steel and a Delrin roller on an adjustable arm. The forming arm adjusts from 14- to 22-3/4 inches and the Delrin ball bearing forming roller is tough enough to form the fender without damaging the paint. It comes with a flange drilled for most four and five-lug car patterns. Since we are truck people, we purchased the truck adapter as well, which covers most five and six- lug truck patterns. The tool comes with a limited one-year warranty and a 60-day unconditional money-back guarantee.