Check the listing for details. Hardened File Guide with Carbide Surface For Knife Making Tool Knife Makers. Condition: New. Listed at 118.49 USD. FEATURES: 1）Multifunctional File Guide-- Perfect tool for squaring off the shoulders of your hidden tang knife. Unique file guide with carbide surface not only used in grinding the ricasso and hidden tang shoulders, but also widely used to line up handle scales. Ideal for knife makers and bladesmiths. 2）Built to Last-- Made of hardened D2 tool steel. Dead flat and high strength. Stable and corrosion resistance. Carbide surface protects your guide while sanding. The carbide is not affected by abrasives other than diamond, so butting them up to a grinder is not an issue. .