Diamond Sharpener Medium - #400

Used the Atoma sharpener to true up my sharpening stone and it worked as expected. Had the stone perfectly flat in no time! Very high quality and a great value.

While 400 isn't quite as aggressive as the regular 320 grit you're probably used to, it's still aggressive enough to completely reprofile an edge in short order. If this isn't enough then Atoma has a 120 grit stone, which I ordered, but I'm second guessing if I'll actually use it now. The 400 takes a little more time, but you're less likely to make a mistake that damages your blade and costs you valuable edge material. Anyways, that's more about sharpening and less about the product itself. These diamond stones are the best I've used. Everything else feels like a toy, and these feel like craftsman tools. They're a little more expensive, but they're worth the cost.

Buy it if you are considering it! I purchased this to flatten my shapton whetstones for straight razor honing and knife sharpening. The raised clusters of diamonds allow swarf to run beneath the cutting surface so it doesn’t load up and become ineffective and need to be rinsed off. I LOOOOVE this plate. It appears that when the plate is too worn, you can replace the top mil with a new Diamond “sheet”. It left my 12k (12000) grit stone perfectly smooth right out of the package. Didn’t need to be worn away at all. Further for knife sharpening, this hogs off material so well so you don’t need to spend an hour on a 1k stone to get the bevel set. Pics were taken under a 50x and ~1000x microscope

I think these are hands down the best diamond plates on the market today. IDC what anyone says. The Japanese have practicality, time, and waste in mind when they made these. And whatever they make in general is usually done with such great detail and quality. I’ve always had respect for them when it comes to manufacturing things. 🇺🇸🤝🇯🇵I have the whole DMT set and they served me well, however the scratch patterns weren’t always the same and the diamonds weren’t nice and uniform like these are. Some of my corse DMT’s are wearing out so I looked into these. When I discovered these Atoma plates had replacement sheets available I was sold! Also the plates are made out of aluminum, which makes my toolbox a lot lighter than it was before with all of my other stones inside.This JIS 400 grit plate was able to put a bevel on my Benchmade Bugout with 20CV steel in 5 minutes. Also when you look under a microscope you can see how much better, neater and more uniform the scratch pattern is. Just remember that Japanese plates/ stones are set to ( Japanese Industrial Standard) “JIS” and American plates/Stones are set to ( American National Standards Institute) “ANSI” which if you look it up. You can see what they’re close to what you’re used to working with.All in all. Worth every damn penny!

Atoma is the only Diamond plates I will use, I use them for knives and straight razors when stone is not enough. Long lasting and dead flat.

Using it to flatten a Shapton 1000, and it works great. A few quick rubs and it removes any concavity from the stone.

if you looking for a really perfect sharp sharp this probably not for you since the diamonds like sprinkled on them and some come loose but for a kitchen sharpener and occasional use have no issues with it- i do have astoma set not used yet cause this stone does the sharp i need i brush up after with a reg stone but gets things sharp enough for easy slicing- and can get blade sharp enough go through paper i satisfied and may be very long time before i need the atomas- the 400 in time not long act more like a 5-600 stone-

I have the 400, 600 and 1200.The 400 is the best overall option of these 3 for initial lapping of new water stones. Lapped stones are then easily maintained with the other two. I then use the 600 for anything 5k and under. The 1200 for 8k and up.A 140 grit is available for extremely fast removal of material. But I recommend you check your stones very frequently to prevent over removal of stone. You'll also need a finer grit to remove the deep scratches from the surface of the stone.My application is for straight razor honing. A very smooth surface is more critical for such, than compared to use for other purposes.For lapping, they will perform best when fully submerged or under running water.