DMT Diamond Whetstone. Fine grit. 600 diamond mesh. Durable plastic storage box with mounting tabs. 6" x 2" Diamond Sharpners. Uniquely designed diamond sharpening stones will hone the hardest material with less time and effort than conventional stones. Interrupted pattern increases cutting action while clearing fines from the diamond surface. Remains flat, requires only water as a lubricant and is virtually indestructible.