Flattening Stone - Dual Grit 120/320 Whetstone Flattener - Re-Level Any Waterstone, Oil Stone & Ceramic Stone - Extra Large 8" Diamond-Groove Silicon Carbide

Smoothed my worn stones perfectly and easily. I had some expensive stones that had been used quite extensively. They had become uneven due to using some areas more than others, as well as some moderate gorges. Placed the stones under running water while running the flattening stone over the surface. I was able to even out the surfaces and smooth out the gorges with minimal effort. I do recommend using them under a VERY light flow of running water. This allows them to slide easily but also lets a light slurry build up which I found makes the process go faster.

I used it a couple of times to flatten a Shapton 1000 grit whetstone. Took only a couple of minutes and did a nice job.

Flattening Stone received was just as described and looks to be of good quality. It was even received slightly earlier than the projected date, which worked out very well. Very pleased with purchase and might buy another as a gift.

It is great stone flattener. I use this to keep my sharpening stone to keep flat, as it eventually start curving. I feel like my sharpening stone can not be useless without this. Unless use this flattener and keep the stone flat, we can't sharpen the knives in correct angle. It might even damage knives. This is a must have, if you sharpen your knife with stone. This is super easy to use. It is worth it for sure. Just buy it.

It works fantastic. My sharpening stones are like new again. Very satisfied. Thank you for a good product.

I started sharpening knives as a hobby a year ago. I read everything I could find and watched a lot of videos. As I continued to study I realized that I needed a flattening stone. I had purchased some sharp pebble sharpening stones. They seemed good so I bought their flattening stone as well. When I started using the FS I noticed there was a lot of gray slush. As a beginner I thought this is the way it is supposed to be. So I continued to use the stone until this month (January 2026). During this time I used the pencil grid method to check that my stones were flat. But also during this time I was unsuccessful at getting a really sharp edge. Again I figured that was because I was a beginner. Then one day I looked at the FS. I was worn down almost flat. The diamond pattern grooves were gone. I figured I was doing something wrong so I bought a second FS. Right from the beginning there was a lot of gray slush and it seemed to take long time to erase the pencil grid even with the coarse side. I looked at the FS and there was already noticeable wearing down of the grooves. The flattening stone is supposed to be harder than the sharpening stone. This FS is very definitely softer than any of my sharpening stones. This FS is worthless. I wasted a lot of time because I thought my stones were flat and that it was my technique that was bad. It took me a year to figure out that my biggest problem was this FS from Sharp Pebble. I hope this honest review saves others from wasting time.

Sharpens a Katana in seconds.

Great product and great prices. I use the sharpening stones already twice and my knife has a great sharp edge again.

Não gostei a pedra se desnivela com facilidade. Usei para desbastar uma pedra 5000

Does the job with no fuss. Much easier to sharpen knives with a flat stone to start with

This flattening stone corrected my sharpening stone in just a few minutes work.

I used it to flatten 1200, 4000 and 8000 g. Stones. Works great, the stone is flat and was delivered without any defects. Good size !

I have the Made in Japan 1000/6000 combo King water stone, I was skeptical about this Made in China flattening stone because some comments said the stone wasn't completely flat. But what the heck, I gave it a try... regardless, it did fix the curved surface of my water stone!!! I showed couple photos showing the work in progress. As you can see, the pencil mark on the top and bottom were gone, that means the silicon carbide of the Sharp Pebble was working. Now, I can continue to sharpen the blade of my Japanese wood plane.