This is a Custom Made Carbide Faced File Guide made by a renound knifemaker. These are made of W1 Steel with Carbide Face and accept a blade up to 2" wide. This can be used on a grinder with 36 grit belt and not EVEN MARK THE CARBIDE!! This file guide will last a LIFETIME. Price is $125 in ConUS. IF INTERESTED PLEASE PM ME. THANKS.