**The Leitz (endorsed and also used by Weinig) Double-Back™ carbide knife system is the industry leader in high-production planing and moulding of abrasive materials.

With the introduction of the Leitz Microsystem (referred by Weinig as there  Double-Back +3™), their carbide knife system became even better. A modification in the system's micro-corrugations provides three additional knife movements, making available a total of nine knife movements.