The DMT W250EFNB DuoSharp 10″ Extra-Fine/Fine is a W250EFNB DuoSharp 10-inch double-sided diamond sharpening stone — Extra-Fine and Fine grits, no-base bench format. Plated and finished at DMT’s Marlborough, Massachusetts plant — DMT’s monocrystalline diamond particles are aggressive enough to flatten waterstones, and the larger DuoSharp / Dia-Sharp formats stay flat indefinitely.
Right sharpening stone for woodworkers, chefs, hunters, and anyone tired of dished waterstones or worn-out oil stones. DMT is the default reference for American-made diamond sharpening.
Diamond Machining Technology (DMT) has been making monocrystalline diamond sharpening stones in Marlborough, Massachusetts for decades. Every Dia-Sharp, DuoSharp, Diafold, and Whetstone stone is plated and finished at the Marlborough plant. DMT’s diamond sharpening surfaces are aggressive enough to flatten waterstones and gentle enough for the final polish on a chef’s knife — the brand is the default reference for American-made diamond sharpening.
