Serious Grit 3.5" (90mm) ceramic sanding discs deliver fast, clean, and consistent performance for pros working with wood, metal, paint, or filler. Designed to fit the Festool RO90 and any 90mm random orbital sander, these discs make your sanding easier and more efficient. The advanced ceramic abrasive cuts more than 40%+ faster and lasts longer than traditional abrasives, helping you get through tough jobs with fewer disc changes. The universal multi-hole pattern works with any 3.5" hook and loop sander and doesn't require alignment—just stick it on and start sanding. It pulls dust through your pad for a cleaner surface and better finish. A tear-resistant film backing keeps the disc flatter for more even sanding, especially on edges and corners, and holds up under both wet and dry conditions. The hook and loop attachment locks in tight while you work and removes cleanly when you're ready to switch grits. If you want a disc that fits right, cuts fast, and holds up through real-world use, this is it.