The orange side was horribly concave (and the gray side convex) by about 1mm. I leveled both sides with a coarse DMT diamond stone under running water. In my case this wasn't a problem as I'm an avid DIY enthusiast and enjoy messing around with things and improving factory bugs. However, if you want something perfect (or even "acceptable") right away, remember that buying this stone is a calculated risk. I also noticed that for some reason the price of this item has magically doubled since I bought it about a week ago. Personally, I wouldn't pay more than ten dollars for this stone. This is a good trifle, however, as whetstones of this size are rare in round/washer tool form.
Computer chair Bureaucrat Knight T1 gaming, upholstery: faux fur, color: milky
27 Review
Office chair Bureaucrat CH-1300N, upholstery: textile, color: black 3C11
14 Review
USA Made Diamond Lapping Paste Polishing Compound 600 Grit Mesh 22-36 Microns For Rock Glass Metal Jewelry Resin Marble With High Concentration Of Diamond Powder By TechDiamondTools
30 Review
Refrigerator Sharp SJ-XE59PMBE, beige
15 Review