Dremel 7/16 In. Aluminum Oxide Grinding Stone the highest industrial quality for extended general-purpose grinding and long abrasive life. It is designed for use on metals, castings, welded joints, rivets, and rust, making it versatile for various applications. This grinding stone works effectively on most materials, including stainless steel, and is specially designed for working with conic surfaces. It features a 1/8" shank diameter and a 7/16" bit diameter, crafted from durable aluminum oxide to ensure reliable performance and longevity. Model Number: 911