Dremel 911 Aluminum Oxide Grinding Stone Go to amazon.com Related posts Best dremel grinding stone for 2022 FeatureThe product is 7/16" Grinding StoneUse on metals, castings, rivets, rustUse for sharpening, deburring and general purpose grinding1/8" shankDo not run in excess of 30,000 RPM DescriptionThe product is 7/16" Grinding Stone. Easy to use.