Complete Knife Sharpening Set: We designed the set of sharpening stones so the three grits would make a good matched set.The 400 grit is an aggressive stone for dull edges. The 1000 grit is used after the 400 or as a starting point for only moderately dull edges. The 6000 grit is a very fine stone and provides a very polished edge that will cut extremely well. Larger, thicker, stone they have plenty of service life in them & are easy to use Peak Performance: Our Professional Whetstone Knife Sharpener Set are Larger,Thicker, Well balanced & allows precision knife sharpening without excessive resurfacing. This whetstones set can sharpen ANY BLADE out there, be it any kitchen knife set, chef knife, steak knife, paring knife, sushi knife, cleaver knife, kitchen knives, japanese knife, butcher knife, paring knife, BBQ knife, Hunting Knife, Pocket Knife & Straight Razor Future Investment: These set of sharpening stone for sharpening your kitchen knives will cost about as much as a good knife. It's a great investment since a whole set of expensive but dull knives is useless. A couple rounds at a sharpening service will cost more then a set of stones, and these stones should last you a lifetime Size: Millstone size 18*6*1.5cm. Bamboo base size 21 * 9cm. Silicone base size 18.3 * 6.4cmMaterial:White corundum Package Contents: 1 * 400 sharpening stone 1 * 1000 sharpening stone 1 * 6000 sharpening stone 1 * Bamboo base 1 * silicone base 1 * correction stone. Only the above package content, other products are not included Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm