SE DF8524DS Diamond Whetstone Sharpening Block, 4-Grits Essential tool for achieving professional sharpening results on knives, scissors and tools Four-sided whetstone, each side embedded with industrial diamonds in grits 200, 300, 400 and 600 Durable ABS holder with non-slip rubber pads for safer and easier honing action Large 6" by 2" surface requires fewer strokes; rotate block for progressively finer abrasion Vented surface can be used wet or dry, provides cleaner plane without build-up