Norton Waterstone Prep Stone is an essential tool designed to enhance the performance of your fine grit sharpening stones. When used alongside a Flattening Stone (#64236), this artificial stone effectively raises an edge cutting slurry, ensuring a smoother and more efficient sharpening process. It helps to even out high spots on your sharpening stones, significantly reducing the need for frequent intensive flattening. Compact and practical, it measures 20mm by 20mm by 3 inches, combining quality craftsmanship from Italy and the USA to deliver reliable results every time. Model Number: