Idahone's Triangular Ceramic sharpening stones are great for sharpening plain and flat edges, awls, darts, fishhooks, and punches. Also fits as replacement rods for Spyderco triangle models.
Available in fine, medium and coarse grits. Grit ratings on the rods are approximately 1200-1500 for the fine, 500 for the medium and 100-200 for the coarse.
Made of high alumina ceramic, the abrasive result of this ceramic sharpener is impressive.