Lansky LDHMD Medium Diamond Hone 280 GritMedium diamond-for keeping fine, sharp polished edge on all knives. All Lansky Sharpening System stones are mounted on specially designed color coded holders with comfortable slip resistant finger grooves and are embossed with grade of stone for instant identification.LDHMD Medium Diamond Hone Medium diamond-for keeping fine, sharp polished edge on all knives.Sizing:Medium 280 grit diamond surface