Stepped and Plain Wooden Ring Mandrel Set with Steel Base | MAN-137.00 Ideal for measuring ring sizes whether you work with wire or metal clay Mandrels are made of wood and the base is made from steel The stepped mandrel is 12-5/8 inches; the smooth mandrel is 11-1/2 inches Enables you to work with metal clay without contaminating other metals Can be used for hand held use, or mounted to the base and attached to a table or work bench