Norton IM313 -11.5" Three Stone Sharpening System - Fine India, Medium Crystolon, and Coarse Crystolon stones
The IM313 sharpening system has long been  considered the to be the ultimate sharpening system. The 2-1/2 In wide x 11-1/2 In. long stone permits long strokes for faster more precise sharpening of all straight edge tools. The coarse Crystalon® stone quickly restores badly worn cutting edges; the medium Crystalon® stone produces the average edge needed for many tools and  the fine India® stone hones to a sharper edge. The heavy base has a non skid bottom. A pint can of Norton Oil is included with each IM313