The Redi-Edge® Original Knife Sharpener is unmatched in its design and effectiveness. The convenient “stick” design gives you a sturdy grip while you use the Duromite™ cutters that are harder than any blade to put the perfect edge on your knife every time. The Redi-Edge® Original Knife Sharpeners are factory- set at a 40° inclusive angle, maintaining a consistent 20° double edge on your knives.