This set comes with three replacement blades for our One-Step Long Point Sharpener. Each blade is made with German steel designed to bend to the One-Step sharpener's unique concave shape. 

To replace your sharpener's blade, simply unscrew the worn out blade from the sharpening unit, making sure to keep the nut and screw in a secure location. Set the old blade aside and align the new blade on the sharpening unit. Replace the screw and nut, and tighten until secure

This video gives you more detail on both the One Step Sharpener, that these blades are for.