... life, durability 4. Various sizes and grits Product name: Knife whetstoneSharpening stone/grinding stone/oil stone/abrasive stone Materials:White ... Coarse/Fine Combination Whetstone Feature1. Two sides whetstone finely hones knife edges2. Hard enough for quick, easy and durable work3. ... the application:10°for filet knives, 23°for kitchen or pocket knives, and 30°for cleavers3. Use the entire surface ...