Check the listing for details. SPYDERCO Knife & Tool Sharpener Set 308FCBN Webfoot and Golden Stone. Color: Yellow, Condition: New. Listed at 202.50 USD. Made in the U.S.A., this pocket knife Knife & Tool Sharpener Set is made of Cubic Boron Nitride (CBN) and Golden Fine-Grit Ceramic and Built-in Angle Guides. This Spyderco Knives 308FCBN Knife & Tool Sharpener Set is 7"L X 3"W X 1/4"H inches. The Webfoot is a uniquely different approach to sharpening that can be used anywhere, set up in seconds, and doesn't require oil, water, electricity, or any complicated clamps or fixtures. With over 15 square inches of abrasive-coated surfaces of varying shapes and angles, the Webfoot can be used to quickly and easily sharpen a wide variety of edged and pointed tools, including those with serrated edges. Resting the wide end of the Webfoot on a flat surface and rocking it from side to side aligns its outer edges at the perfect 40-degree included angle for utility knife edges.