【4-in-1 Design】: This unique CBN Radius Wheel has the addition of a 1/4" radius on both edges for sharpening hollowing tool bits and scrapers. 【Size and Grain Size】: 8 inches in diameter, 1.25 inch wide, Bore 5/8 inches, 320 grit 【High Quality】：This CBN grinding wheel will not be deformed no matter how long it takes, so you don't need to constantly adjust your jig, and you don't need to dress the wheel. 【Applicable to Most Bench Grinders】：Use this wheel for the most precise grinding even on the most common grinders 【After-Sales】: This CBN grinding wheel has been exported to many countries in the world, you can fully trust its quality.We will handle any problem for you within 24 hours This unique CBN Radius Wheel has the addition of a 1/4" radius on both edges for sharpening hollowing tool bits and scrapers.