AM-K series stones are made of aluminum oxide and have an average hardness

Atago (愛宕) Whetstone is mined in Japan

and then polished

Includes complimentary 120 grit silicon carbide stone

Grit ratings on the rods are approximately 1200-1500 for the fine and 100-200 for the coarse

digital angle gauge AM-K series stones are madeIt's very important to keep a sharpening angle consistent on a guided knife sharpener. The angle should not change when replacing one sharpening stones to another. In order to control the sharpening angle, one measures the angle between the knife plane and the sharpening stone. There are many similar digital angle gauges on the market. This model is very light, which is a huge advantage when using with conjunction with a knife sharpener.