The Chef'sChoice Diamond Hone exact-V Sharpener Model 415 features a two-stage sharpening system using 100% diamond abrasives. It's the only "V-type" manual sharpener which combines the essential key features to consistently excellent knife sharpening: a removable spring-loaded sharpening guide, two-stage dual angle sharpening and 100% diamond abrasives in an easy-to-use, compact design that is safe for quality knives and tools. By applying Chef'sChoice technology to the vintage "V-type" sharpening method, users are provided with the ability to accurately reproduce a double-bevel edge for razor sharpness and durability with the 415. It puts an exceedingly sharp edge on a broad range of knives including hunting knives, pocket and fish fillet knives as well as kitchen cutlery, household knives and tools. It can be used on knives of any size, sharpening all the way from tip to bolster or handle. By incorporating precision angle control, the Model 415 eliminates the key reasons why conventional V-type sharpeners fail to consistently produce satisfactory results.