These blades fit all of our products except ShearSharp. We use only the finest American Made carbide available, and Diamond Hone it to a mirror finish for the best possible sharpening edge. The result is the finest line of carbide sharpeners on the market today, at any price. These blades are reversible for double life and most users report an average life of 5-10 years between replacements. Beware of other brands that use cheap imported carbide! Insist on AccuSharp!