Norton 61463654461 8x3x1/2 in. India Sharpening Systems, Medium Alum. India - smooth cutting aluminum oxide abrasive, our patent for a fine finish for long lasting cutting edge; The choice of artisans, craftsmen and mechanics; Ideal for clean deburring, generating keen edges and quality finishes Benchstones are ideal for hand dimensioning and sharpening of all types of knives, plane blades, chisels, scrapers, or any other tool that needs a flat, sharp edge The IM83 is designed like all our other sharpening systems, the stones can be replaced to customize the unit to individual requirements The use of oil with sharpening stones enhance the sharpening action and minimize the clogging of the stone's surface Norton Sharpening Stones have been the world leader for over 150 years