Diamond Machining Technology (DMT) W250CXNB DuoSharp Double-Sided Diamond Sharpening Stone, Coarse/Extra Coarse, 10 Inch

I have had a 8"x 2 5/8" DMT diamond plate in fine/extra fine grits and I really like using it to sharpen my woodworking tools, however, I needed a coarser grit to sharpen a damaged plane blade. I happened onto this 10"x4" DMT plate at a very good price at the Amazon Warehouse. I figured there wasn't much risk in a used diamond plate, since it is nearly indestructible. A bonus was that it came with a base. I love the 10" plate, where you can take a longer sharpening stroke which speeds up sharpening. It cuts aggressively and evenly. Diamond plates are also good for flattening waterstones and the 10" size is a bonus for that task.

While I'm no sharpening expert I know a little bit about grinding and honing tool edges, primarily plane irons. Previously, the rough grind would be done on a grinding wheel attached to my bench grinder/polisher which did the job, not well, but OK. Following that I would hone the rough edge with sandpaper and water stone. I got tired of re-honing the grind on 80 grit paper which was a lot of work so I decided to try the DMT DuoSharp Bench Stone with coarse/extra coarse sides. What a pleasant surprise. The extra coarse side took off the old metal and created an excellent properly angled surface in less time than my grinder and the coarse side took the place of the 80 grit paper, again, in half the time. After the coarse honing I went back to 120, 240, 800, and 1200 paper before using the water stone, but each successive honing was much easier after establishing the original bevel with the DMT W250CXNB. It IS a little spendy but worth it If you do a lot of tool sharpening. You can spend the extra money and get a holder for the stone but it comes with a non-slip pad which works great so the holder isn't really a necessity. I was so impressed with this item I recently purchased the DMT DuoSharp Fine/Extra Fine stone for the next level.

These are awesome! I both a set of two that covers 4 grits. I use them with water, not oil. Unlike a stone, they don't end up with uneven ware out towards middle. You don't have to worry about moving the blade so that you can keep ipthe surface flat. I typically use sand paper glued on a hard flat surface to do my sharpening. And I loved that method for years. But the papers ware out, sometimes you get the edge so sharp that you end up cutting into the paper. I think I will still continue to use that method for Some things, but these are really quick to pull out and do a touch up on a chisel or a scraper. They are a bit expensive, but if you consider how much longer they will last compared to a stone, they are probably not a bad deal. I also used these to flatten the bottom of a #80 scraper plane. They worked great, with a little bit water, it took me 15 minutes to do the job instead of perhaps an hour that it would have taken with any other method. I recommend them.

After using Arkansas stones and getting frustrated, this really impressed me in the way and speed it cuts through material. I bought 4 grid sizes: Extra Course, Coarse, Fine, and Extra Fine. I use it mostly for plane sharpening, and it flattened and straightened the edge in no time. I'm glad I bought the 10". Make it so much better. Quickly sharpened my buck knife as well. Next I'll try some chisels that I grinded wrong on my grinder. I'm sure it will do a nice job there as well.

Stays flat. Great for lapping stones flat or getting the first edge on a chisel or plane blade. Just a little pricey, but you get what you pay for.

This piece completes my set of Duosharp 10 inch bench stones. The extra coarse is a big step from the next finer grade, and I doubt that anyone really needs a bench stone coarser than this one. To illustrate, let me tell you that while in use the stone is noisy, as in "Wow, this extra coarse stone sounds like I'm scraping my butcher knife on concrete!". I bought it for sharpening tools, but since I had a new, extremely dull, very large butcher knife I put the initial edge on it with the extra coarse. It works fast and it leaves a rough edge, but if your goal is to cut a new profile on a knife this stone will do the job. After working for a while to get the profile cut with the extra coarse side a few passes with the merely coarse side gave me a knife that would cut paper easily. A little polishing work with a fine stone and I had a remarkably sharp butcher knife in much less time than I could have without using power tools, with no risk of overheating the blade and ruining the heat treating. If you have the plastic base (it was cheaper to buy it separately than with the stone, don't ask me why) you can flip it over and use the handle to sharpen garden or woodworking tools, too.

We use these stones for sharpening speedskating blades. They work fantastic and are very durable.

This stone is really great. I bought a DMT course stone from another vendor, but it wasn't aggressive enough to reset the angle of my hand planes I use for wood working. I ordered this one, and the Extra Course side made quick work of changing the angle. The large 10'' size makes sharpening and honing very convenient and easy for my MK II to slide across. After this I can quickly finish up with a Shapton 1000 grit, and put the final polish on it with a Shapton 4000 grit. The outcome is outstanding thanks to this awesome stone. Highly recommend it. It came with a non slip mat which was nice too.

Great product. Its main use is to flatten my waterstones which I still use to sharpen plane blades instead of using my electric sharpeners. Sometimes the manual way is the best way. This two sided diamond bench stone has a large surface area making it easy to use on the waterstones. Cleans off easily. Stores snuggly taking up little space. You can use it to sharpen tool blades that are nicked and worn, too, but I prefer to save this for the flattening jobs.

Getting to like it more over time. Previous stones blistered and shed their nickel matix in places leaving holes which led to blades catching and ripping even more out. So far this seems to be an improvement. Price is certainly more competitive than prevously.

C'est l'investissement indispensable pour avoir des outils vraiment tranchants. Le prix s'oublie, la qualité reste... Permet de raviver les fers de rabot, ciseaux et bédanes. (idéal pour les outils d'occasion achetés sur les vide-grenier et LBC...). Important : à utiliser toujours humide avec de l'eau et un peu savon pour la glisse. Ne pas appuyer fort, rester patient. Bien sécher la plaque après usage (soleil, radiateur, séchoir, etc). Stocker dans une boîte au sec. Produit complémentaire : une bonne pierre à eau de finition ( par exemple ceci d'un fabricant Canadien : https://www.amazon.com/dp/B07VV6BR16/). Bonne journée

Very good quality. It cuts really quick and performs consistently use after use. Totally worth every cent.

I was looking for a good lapping stone for my water stones and this was perfect, Strong and durable this worked perfectly