Zirconia Alumina Fiber Sanding and Grinding Discs, 4.5 x 78, 36 Grit - 25 Pack

**** The Zirconia Alumina Fiber Sanding and Grinding Discs are robust abrasive tools designed primarily for metalwork, bringing a blend of quality and effectiveness that has garnered positive feedback from users. With a grit rating of 36, these discs are known for their aggressive performance, making them exceptionally handy for tasks like weld cleaning and aggressive material removal. Many users appreciate how they can leave behind a smooth surface finish, highlighting their effectiveness in creating nice flat grinds. A distinct characteristic of these discs is their design; they are intended for high-speed grinder use and require a backing plate, which is not included in the package. Although some users find this a minor inconvenience, they have devised creative solutions, such as stacking multiple discs or employing double-sided tape to use them effectively. This adaptability underscores the product's versatility, especially for metal, plastic, and fiberglass applications, although they can be deemed too aggressive for woodworking tasks. Durability is a mixed bag; while they last significantly longer than standard options, users should manage their expectations compared to flap discs. Most find that they provide ample use for medium-sized projects without professional-grade longevity. The quality of the zirconia abrasive has also been praised, with many stating they perform better than aluminum oxide alternatives. Overall, these sanding discs stand out as a solid choice for metalworking endeavors, offering good value and satisfactory results. **