This Bosch bonded abrasive wheel is made with high-quality Aluminum Oxide grain for exceptional speed and durability in hard-to-reach areas for fast metal cutting. The grain's high-tensile strength helps prevent fracturing. Specially formulated resinoid bonds are applied to help ensure long wheel life. Multiple layers of long, stranded fiberglass are woven to form an exceptionally strong reinforcement layer to stand up to metal-cutting jobs. This Type 1 straight wheel is designed for speed. It is an optimal match with the Bosch GWS12V-30 3 In. grinder. It is compatible with standard 3 In. grinders and cut saws with 3/8 In. arbors.