For years when you wanted to paint the wheels on your rolling stock you had to hold them in your hand, well not any longer. This jig is laser cut form clear acrylic; the jig is designed to hold the wheel so paint does not get on the surface of the wheel. Each jig will hold 4 wheels, enough to do one car. The weathering jig comes fully assembled; all you have to do is insert wheels and paint. Included is a very quick and easy way to paint and weather wheels. There is two versions available one for 33" wheels (Item #300) and one for 36" wheels (Item #301).