Norton 3 Stone IM313 System Sharpening
The Norton IM313 System includes three 111/2" x 21/2" Norton Stones. These large stones are long enough to handle any knife or tool thrown at them. The first stone is the fastcutting Coarse Crystolon stone. This stone is made of silicon carbide and is used on dull edges. The second stone is the Medium Crystolon stone to refine the edge.