KING Whetstone Knife Sharpening Stone with Plastic Base S-45P #4000176&times;52&times;15mm (6.9 x 2 x 0.5") Size: 176 x 52 x 15mm Weight: 399g Grit: 4000 (for super finishing) Material: whetstone: Special abrasive material, base: plastic Requires submersion in water before use.