Norton 69936687444 Flattening Stone with Diagonal Grooves for Waterstones, Coarse Grit Silicon Carbide Abrasive, Superbly Flat with Hard Bond, Plastic Case, 9" x 3" x 3/4"

Most lower priced options sometimes come bent from the factory and can be a lottery. This was perfectly flat. It remains priced on the lower end but does the job well. Decent size, overall a good flattening stone. Would buy again.

Excellent

I'm an old-timer, well into my sixth decade, and also a third generation craftsman. My dad and granddad both had oil stones and by choice, and also virtue of my occupation in the metal trades, I have acquired well over a dozen different oil stones, some of which have suffered neglect. I was torn between this product and a diamond plate but settled on this Norton Flattening Stone. Man was I ever surprised at how well this thing works - and fairly quickly too. My first test was on an India Oil Stone and I used it dry, without any water. It was easy to see how the diagonal groves filled with dust from the India stone. The grooves clean out easily with an old shoe brush. BTW, all oil stones were pre-cleaned with brake cleaner prior to grinding. I make plenty of custom stones for hard to reach areas and this flattening stone works wonders for dressing a surface flat after a rough cut with a diamond wheel. Subsequent to my dry test, most all of my work has been done with water and a few drops of dish soap in an old steel baking pan. If you are working in your wife's kitchen sink you better protect it from the grit which will ruin porcelain or stainless. There seems to be some obsession in the comments regarding the degree of flatness. This seems odd to me but whatever. Oil stones and water stones are for hand sharpening - it's not a precision surface grinding operation, and the advantage here is that the craftsman can (if he or she chooses to) use a little "English" on one side of the stone or the other. To each his own I suppose. Negatives: it comes in a cheesy thin plastic box which does not allow for venting of the moisture in any meaningful way. If they must use plastic, use a proper "alloy".

Instructions were included. Flattened my slightly saddled 450 grit whetstone. Took abt 15min. The edges of the whetstone lost small little chips, but I think that should not affect its use. Like the fact that it comes with a storage case. Didn't like the fact that Amazon stuck a label on it with a full wraparound of wide cellophane tape that left a sticky residue all over. I ended up cellophane taping the container so that it doesnt stick to other things I stack on it in storage.

Llegó sin golpes, tal como se específica en la descripción del producto Gracias

First time I have used a flattening ..... does a great job.

It quickly smoothed out my wetstone, just as advertised. Very happy with it.