【4-in-1 design】：Our CBN grinding wheel has a radius of 1/4 inch on each edge, making it easy to grind hollow tools such as drill bits, scrapers, etc 【Accurate Size】: 8 inches in diameter, 1.25 inch wide, 5/8 inch bore, 1000 grit. Accurate size, perfectly matched with your desktop grinder, without shaking,6061 aluminum body 【High Quality and Long Life】:This CBN sharpening wheel is plated with the best quality CBN grains. And fully plated with nickel, it has high compressive strength and good shape retention. No matter how long it is used, it will not be deformed, so you do not need to adjust the fixture, and you do not need to trim the grinding wheel 【Match Your Bench Grinder】：The CBN wheels have passed strict balancing tests, so they will not shake when mounted on your bench grinder. Even on the most common grinder, you can use this wheel for the most accurate grinding. Recommended speeds are 1000 RPM to 3600 RPM 【After-sales Guarantee】: We are the source manufacturer of grinding wheels, after the purchase of the goods have any questions or quality problems can contact us at any time to request a refund Why choose CBN grinding wheel: CBN grinding wheels have been used in manufacturing processes for many years and are now available for common bench grinders. CBN crystals are electroplated on to a precision aluminum grinding wheel substrate resulting in the finest grinding wheels available today. CBN wheels outperform common stone wheels in many ways. Features:Wheels are made from an aluminum core, which is lighter in weight than steel and will run smoother on all grindersIdeal for sharpening woodturning tools (High Speed Steel only)Designed for use with bench type grinders; 1000 RPM (Preferred) or 3600 RPMWheel diameter does not change over time. What's in the box:1 x CBN Grinding Wheel 8 inch 1000 grit 1 x A pair of anti cutting gloves.