Norton Round Edge Fine India Slip Stone with fine grit aluminum oxide abrasive. To improve sharpening & reduce clogging, use with oil. Great for sharpening carving tools, V-tools, & gouges. 4-1/2" length  x  1-3/4" width  -  1/2" x 3/8" thickness. Oilstone made by Norton, Saint Gobain. Model FSSP44.
Norton Fine Multi-Form Slip Stone