DMT Dia-Sharp Bench Stones - CoarseGuaranteed not to hollow or groove, DMT's precisely engineered Dia Sharp Bench Stone with continuous diamond surface assures consistent, even sharpening every time. The 8 in. length is ideal for a variety of knives and tools, providing cutting edge performance for edge repair and honing. Also a great alternative to power grinding, you won't have to worry about ruining the temper of your tools with Dia Sharp Bench Stones. Perfect for flattening plane