When it stops cutting. This is a series of easy-to-handle whetstones selected for home kitchens. The whetstones are priced affordably, but the quality is comparable to whetstones used in professional settings. If you have a whetstone base, you can add or replace only the whetstone, so there's no waste. Each grit size is a perfect fit for the separately sold angled whetstone base (SKG-26) [183 x 63 x height 20 (27 for double-sided) mm]. SKG-22 Product Number: SKG-22 Medium Grit Whetstone #1000 Whetstone Size: 183 x 63 x 20mm Approx. 400g Quantity: 20 Suggested Retail Price: 1,800 yen (excluding tax) JAN Code: 4966684061767 No claims, no returns.