Spec says 0.50 inch. I received 0.37 inch stones. Cook n Home was contacted first as the enclosed card asking for it to be sent - no reply - was forced to put it into operation making the return unjustified. Quality is good (no idea why "easy to clean" in the review list as using stone cleaners is bad). Bought because of the thickness. Since Cook n Home never responded, I have no idea they even have .50 inch thick stones. PS: They do their job, but when it comes to stones, the thicker the better. Ask any Scot
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