The Double Sided Diafold® sharpener is one of the most versatile sharpeners. The two sides of diamond sharpening material allow you to tackle tough sharpening projects. The folding design makes this sharpener easy to keep close at hand in your tool box, backpack, or pocket. The stone measures 4-1/4" x 7/8", fully extended with handle it measures 9.5". Choose from fine/coarse, extra-coarse/coarse, and extra-fine/fine and extra extra fine/extra fine. Made in the USA.