DMT Duo-Sharp 8" Diamond Stone review

Form

Discs

Grit

1200 grit

Material

diamond

The verdict

Where this pick fits.

The diamond plate that gives you a cutting edge before the sandpaper sees the wood. Extra fine for honing, not for stock removal.

The step before the first stroke. A sharp edge changes everything after.

Quick take

Best for: sharpening chisels, plane irons, knife honing
Format: Discs
Tier: Pro tier

Use it when

The fit is obvious.

· Reach for the DMT Duo-Sharp 8" Diamond Stone when the job is sharpening chisels, plane irons, and knife honing: that is the fight it was built for.
· Diamond is the only grain hard enough to boss stone, glass, and cured concrete around. Everything else just negotiates.
· This is refinement territory. It flatters a surface that is already close; it will not rescue a rough one.

Skip it when

The job asks for something else.

· Leave it if you still need to remove stock, paint, filler, or machine marks; fine grit only polishes over problems it cannot fix.
· Leave it if the budget is tight enough that value-per-pack matters more than top-end feel and longevity: good mid-tier paper will get you there slower.
· Leave it if the work is edges, profiles, and tiny repairs: those are easier to control by hand.

Best for

Where it earns its keep.

· sharpening chisels
· plane irons
· knife honing
· tool maintenance

Keep moving

Useful next clicks.

Read the grit chartSee where this pick sits in the full climb.Browse projectsSee the exact grit climb for your job.

Buyer questions

The practical questions.

What is the DMT Duo-Sharp 8" Diamond Stone actually good at?

The diamond plate that gives you a cutting edge before the sandpaper sees the wood. Extra fine for honing, not for stock removal. In short: it earns its keep on sharpening chisels, plane irons, and knife honing.

Is 1200 the right grit lane for this?

Treat it as a discs decision first. Reach for discs when you already run a hook-and-loop random orbital and want fast, even coverage across broad ground.