This built-in angle guides Knife & Tool Sharpener Set was developed by Spyderco Knives. It is made from high-quality Cubic Boron Nitride (CBN) and Golden Fine-Grit Ceramic and measures 7"L X 3"W X 1/4"H. 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. Simply keep the plane of your blade vertical and draw it from heel to tip. The included ABS plastic base reduces that angle to 30 degrees for keener edges and thinner, high-performance knives. Laid on its side, it offers the perfect 12.5-degree angle for sharpening scissors and shears. This set includes one Golden Stone, one Webfoot, two suede pouches, one plastic base, and an illustrated instruction book that explains how to use the sharpeners to put an edge on practically any cutting tool in your home.