Milwaukee® 7" Type 27 Grinding Guard Assembly is designed for 6088-20 sanders/grinders, 6088-20 7" grinders, 6088-30, 6089-30 7" and 9" grinders with lock-on, 6089-31, 6088-31 7" and 9" grinders and 6089 sander. Grinding guard can be used for grinding wheels without threaded hubs.