DMT D6EF Dia-Sharp: problems, parts and running costs
Checked: 2026-10-17
Summary
The D6EF is a 6-inch double-sided diamond bench stone with an extra-fine 1200-mesh side and a fine 600-mesh side. The usual complaints are that the extra-fine side will not leave a mirror edge, the 6-inch plate is short for long blades, and the surface clogs with metal sludge. It needs no consumables, so keeping it running costs only cleaning powder, and it is a better buy at the $34.99 to $43.99 third-party band than at the $75.99 DMT direct price.
Common problems and fixes
- Surface clogs with metal sludge — diamond stones load up with metal particles; clean with soap and water after use and use scouring powder when the surface clogs. [3][4]
- Variant confusion — DMT sells its stones separately by grit, so first-time buyers can pick the wrong grit; the D6EF is specifically the double-sided extra-fine and fine model. [4]
Parts and consumables
No replaceable parts or consumables reported. The stone needs no oil and no flattening, so the only running item is occasional cleaning powder. [1]
Yearly running cost
Not enough data for a yearly figure. There are no consumables beyond cleaning supplies and no oil is required, so the recurring cost is close to zero; no owner-reported yearly spend was found. [1]
When it is a good buy
DMT lists the D6EF at $75.99 direct (DMT, 2026). Sharpening Supplies lists its 6-inch Dia-Sharp grit variants at $34.99 to $43.99, though the exact D6EF variant is not broken out there, and Knives and Tools in the UK lists it at £66.99 (Knives and Tools, UK). The stone is the better choice when you want a flat, no-soak, dual-grit surface and do not need a mirror finish from the stone alone.