Forney 1 In. x 1 In. Concave Grinding Stone is crafted from durable, high-grade aluminum oxide, making it i for grinding, polishing, or deburring ferrous metals and other hard surfaces. Designed to be shank mounted, this grinding stone is for use with high-speed drills, especially in situations where larger wheels cannot fit or smaller abrasive wheels wear out too quickly. With a 1/4" shank diameter and 60 grit, it efficient performance and longevity. This concave grinding stone is a reliable choice for precision work and tough applications. Model Number: 60034