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💎 Sharpen smarter, not harder — the pro’s choice for unstoppable edges!
The DMT D8C 8-Inch Dia-Sharp Continuous Diamond Coarse is a premium USA-made sharpening stone featuring a micronized monocrystalline diamond surface that sharpens knives faster than traditional stones. Its coarse grit is perfect for quickly restoring dull edges on a wide range of blades without the need for oil, using water or dry sharpening instead. Built with durable metal construction and backed by a 25-year warranty, this tool offers professional-grade performance and longevity for serious sharpening enthusiasts.

















| ASIN | B0001WP1L0 |
| Best Sellers Rank | 199,174 in DIY & Tools ( See Top 100 in DIY & Tools ) 201 in Sharpening Stones |
| Brand Name | DMT |
| Colour | Grey |
| Country Of Origin | USA |
| Customer Reviews | 4.4 4.4 out of 5 stars (864) |
| Global Trade Identification Number | 00017042007683 |
| Grit Type | Coarse |
| Included Components | 1 x 8-Inch Dia-Sharp Continuous Diamond Coarse |
| Item Dimensions L x W x H | 14L x 6.5W x 3.5H centimetres |
| Item Type Name | Knife Sharpener |
| Item Weight | 1 Kilograms |
| Manufacturer | Acme United Corporation |
| Manufacturer Part Number | D8C |
| Manufacturer Warranty Description | Guarantee – you acquire from dmt with purchase of our products in europe also a promise without restriction of your legal warranty rights. If your dmt product fails to perform due to defects in material or workmanship, we will replace it 25 years after purchase free of charge. Normal wear, improper cleaning or misuse is not covered by the warranty. Defective products will be repaired, replaced or … |
| Material Type | Metal |
| Model Number | D8C |
| Number of Items | 1 |
| UPC | 971494322834 017042007683 798256211096 |
| Unit Count | 1.0 count |
R**S
Hassle free in every way!
The first one I recieved had a tiny imperfection (a bump in the casting) but Amazon returns are so easy I got a replacement within a couple of days. The plate itself is great and cuts really nicely. I used to use nothing but water stones but having to flatten them all the time becomes a real pain. These dimaond stones are worth the investment and I'll be replacing my last two water stones once I have more funds.
D**T
Unbelievable quality.
Great quality! So happy I finally took the plunge and bought one! Now I need to buy in fine/super fine. I already have the wave sharpener in fine and it really does a fantastic job on gouges, so won’t hesitate to buy more when I can afford to.
M**H
Great item, excellent value (cheapest price i could find ...
Great item, excellent value (cheapest price i could find online), fast delivery. I brought this for flattening my water stones, works great. Very happy.
N**L
Lapping stone
Bought this to lap flat my Norton whetstones. Works well on low grit stones but pretty slow cutter on the higher grits i.e 4000 and up. Easy to clean with some cream bathroom cleaner or toothpaste and a bristle brush. Best price for this item I could find online. Did take 6 days to arrive though. Although must add I took standard delivery option.
M**K
good quality
very good
J**.
Very poor quality
Sharpened one large cleaver, flattened one 1000 grit whetstone and it's very much the worse for wear. I expected a lot more longevity at this price point.
C**E
Three Stars
Not sure coarse was the right decription
I**.
Good stone.
May be not quite as course as expected but agood stone.
T**T
Very good quality sharpening solution. I use it to sharpen plane irons and chisels and I've not seen the slightest sign of fatigue after several months of use. Guaranteed flatness, and no need for lapping... ever. To use, all that is needed is a small amount of liquid to lubricate (the manufacturer recommends water -- glass cleaner is another option with no adverse effects), then sharpen, then wipe off the slurry (the swarf is sign that it's working). The plate is quite heavy, but it helps keeping everything in place while sharpening. Let it dry and store it away. easy. I've found I can obtain results faster by applying very little pressure -- no need to force weight down into the stone to sharpen. There is a small break-in period, after which I started getting bluish halos (photo attached). It's a tell-sign cleaning is due, which can be done easily by a good scrubbing with a toothbrush and some kitchen/sink cleansing powder agent (such as calcium carbonate and sodium carbonate). The surface can also reportedly be cleaned with a high-polymer eraser. Even easier! Very responsive support from the manufacturer. Very satisfied customer! The prices for the coarse, fine, and extra-fine stones fluctuate somewhat, I'd recommend setting a watch.
K**Y
I own 4 DMT diamond stones. Unfortunately, everyone I have bought before this one has defects. I am happy with this stone though. My extra coarse stone is missing diamond coverage all along the edges and has a big blotch missing in one of the corners. My DMT fine stone has extremely bad grit contamination that you can not only feel, but can hear, when sharpening. So, I was happy when I finally got a DMT stone that didn't have grit contamination and has complete diamond coverage including along the edges. It is unfortunate that it took 4 stones to get a good one. To say DMT's quality control is subpar is an understatement. I kept seeing good reviews and so thought maybe I was getting lemons, just a random bad one. But no. Everyone stone except this one had significant defects. That being said.... even with the defects the stones work well enough and will last. I know it's odd to say so much negative and have a 5 star review. That is simply because this stone was exactly what it should have been. No grit contamination, no missing coverage and a great stone. It cuts fast and leaves a uniform scratch patter. It is well built and will last year's making it a great buy for $50. If you can get a DMT diamond stone without any significant defects, then you're getting a good buy. These stones will last for a very long time if you take care of them and can cut any steel type including super steels like s110v or s90v.
A**I
Pessoalmente acho muito agressiva para usar diretamente nas lâminas, pois remove muito material. Estou usando para retificar minhas whetstones da King e da Suehiro e para isso essa pedra diamantada é fantástica. Nunca consegui retificar minhas pedras usando lixas e outros métodos mais baratos então resolvi arriscar. As pedras diamantadas da DMT não são baratas mas valem a pena. Retificou minha King velha de guerra, que acumulava uma barriga considerável depois de mais de 10 anos de uso. Como foi necessário desbastar muito da pedra demorou um pouco (quase 3 horas de trabalho). Mas ao final o trabalho ficou ótimo e a pedra diamantada ainda estava como nova. Recomendo.
D**E
Ich liebe scharfe Werkzeuge, aber das arbeiten mit Wassersteinen wurde mir auf Dauer zu mühsam. Erst einweichen und dann nutzen sich die auch relativ schnell ab, mann muss sie immer wieder abrichten damit sie eben sind und man muss mit relatov hohen druck arbeiten. Die Diamantplatte von DMT erledigt all diese Einschränkungen. Sofort einsatzbereit wenn sie benötigt wird, kein Abrichten notwendig da hier mein Material von der Platte abgetragen wird und mit leichten Bewegungen ohne viel Druck super Schleifwirkung. Nutze den Platte nun mehrere Monate und kann noch immer keinen Verlust der Schleifwirkung feststellen. Ob Küchenmesser, Gartenschere oder sogar Snowboard, alles wird souverän gemeistert. Das einzige Problem das DMT vielleicht hat - die Platten halten echt lange, also so schnell werden sie mir keine neue in der gleichen Feinheit verkaufen können.
G**N
Las placas diamantadas DMT son las mejores del mercado. Si se les da un uso inteligente duran toda la vida. Vistas con una lente de aumento, son todo un espectáculo al percibir la uniformidad con la que están distribuídos los diamantes monocristalinos (los de mayor calidad). Esta granulometría "Dia Sharp COARSE" denominado en la página de venta como "Grueso" es la adecuada para el vaciado delicado de cuchillos, antes de afilarlos con piedras de grano más fino. Yo la utilizo humedecida, aplicando muy poca presión, con mucha paciencia. Nada de hincar con fuerza la punta del cuchillo hasta que salten los diamantes por el suelo. Como cualquier herramienta con diamantes, al principio "come mucho material" y después es cuando ya coge su ritmo de trabajo. Al terminar, lavarlas con agua y secarlas con un trapo limpio, esperando que haya perdido todo rastro de humedad antes de guardarlas en su caja. La planitud de la placa es tan buena que se puede utilizar para lapear (rectificar) las piedras de afilado, ya sean naturales o sintéticas, siempre con agua. Por supuesto, no comparar estas placas con similares muy baratas que venden en sitios chinosos on-line. Afilar un cuchillo es un arte que hay que hacer con mucho mimo.
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