Durable heavy steel powder coated construction. Increase tire and fender clearance, flare fenders and/or repair wheel arch collision damage with this professional grade forming tool. Bolts directly to hub flange. Elongated holes in adapter plate fit all popular 4 and 5 bolt hubs, and are held in place with the included dished washers and vehicles lug nuts.It will accommodate up to a 120.6 mm (4.75") 4 and 5 lug bolt circles. Forming arm adjusts from 14" to 22 3/4" Delrin® ball bearing forming roller is tough enough to form the fender without damaging the paint.To prevent paint from cracking when forming wheel arches gently heat the paint before forming.