This thing is heavy! I use it to sand small parts on a flat service. I was using a thick piece of glass previously but this makes it easier because it is higher off the table and doesn’t move. Machinist straight edge shows it’s straight.

So smooth, so flat, so heavy. This is a perfect size and a must have for the serious knife maker or small scale machinist. When flat matters, a surface plate is a must! This will outlast me if I take care of it. Great price.

Passes my inspection. The surface indeed appears to be at least close to the stated flatness, according to my testing with a .0005" indicator, which can only measure about +/- .0001 reliably.Be aware that the sides are not square with each other, or square with the face. Not even close. So if you need a square, consider a higher end plate that would probably also be precision ground square on 5 sides.

The product I received had a large chip on one corner, and a small chip on another corner. I am not sending it back, and without the chips, I might have given it five stars. VERY heavy/dense slab, seems to be very flat, and should work well for my purposes. But the chips are very disappointing, though they will not actually affect my use of this item.

The product I received had a large chip on one corner, and a small chip on another corner. I am not sending it back, and without the chips, I might have given it five stars. VERY heavy/dense slab, seems to be very flat, and should work well for my purposes. But the chips are very disappointing, though they will not actually affect my use of this item.