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The Work Sharp® Whetstone Knife Sharpener is an Angle Guided, Dual-Grit sharpening water stone for kitchen knives and folding knives. Premium 1000 grit and 6000 grit aluminum oxide sharpening stone creates incredibly keen edges. A sharpening base provides a stable platform and increased water control for less mess and faster clean-up. Angle Guides create precision and consistency making sharpening faster and easier. Sharpening Guides are interchangeable from 15° or 17°. The Whetstone can also be used freehand without guides.