A roll bending die for bending metal into an arc with reinforcing ribs and tapered ends. The roll bending machine includes a body member being designed for being rotatably coupled to the roll bending machine whereby the body member selectively engages a pliable roller of the roll bending machine. The...http://www.google.es/patents/US6751995?utm_source=gb-gplus-sharePatente US6751995 - Roll bending die
