The 7" 40 Grit Flexible Diamond Disc is built for aggressive surface grinding and heavy material removal on hard construction and pool materials. With industrial-grade diamond abrasive bonded to a flexible backing, this coarse disc is well-suited for tough applications like grinding down rough quartz finishes, shaping natural stone, or prepping concrete overlays. Its 40 grit rating makes it ideal as the first step in a multi-stage polishing sequence, cutting quickly through surface imperfections and buildup. It’s compatible with most 7" polishers and grinders when used with a proper hook-and-loop backing pad, and performs best in wet polishing environments for cooling and dust suppression.