
The surface is fairly flat. Other reviews point out that the stones are a few millimeters smaller than the slots they sit in and therefore the box cannot be used for actual sharpening. I don't think it's a problem, I put a small amount of putty on the top of each and now they're set like a rock. A folded piece of paper tucked in there would probably work in a pinch. the duration for which they will last. I started using them to reshape a knife with a broken tip, by the end the roughest stone was almost entirely gone. Its surface is now thinner than the ultra-fine stone included in the kit. Waste of money unless you really need to sharpen occasionally (even then a better double sided stone may serve you better).

Effortless Sanding with Dremel EZ407SA Drum Sanding Mandrel
3 Review

๐ฉ Simpson Strong-Tie PMANDREL75 RC Drive Mandrel
3 Review

๐จ Enhance Your Woodworking Skills with PSI Woodworking PKM FLC Maxi Mandrel Morse
3 Review

๐ฆ A16010600Ux0647 Abrasive Sanding Sandpaper Mandrel" -> "High-Quality Abrasive Sanding Sandpaper Mandrel (Model A16010600Ux0647)
3 Review