How to Use – The Model 4643 Knife Sharpener - YouTube
Amazon.com: Chef'sChoice 4643 Manual Knife Sharpeners 15 and 20-Degree for Serrated and Straight Knives Diamond Abrasives, 2-Stage, Gray: Sharpening Stones: Home & Kitchen
The Chef's Choice 4643 AngleSelect professional manual sharpener is ideal for both 15- and 20-degree class knives. Using 100 percent diamonds, the hardest natural substance on earth, our patented abrasives sharpen edges