2 Sharpening Stone Blade Knife Sharpener Block Tool Set This is a new set of 2 aluminum oxide sharpening stones These can be used to sharpen knives, scissors, gravers, chisels, etc One stone measures approximately 6" x 13/16" x 3/8" (152 x 21 x 9.5 mm) The other stone measures approximately 3 13/16" x 7/16" (97 x 11 mm)