Milwaukee® O-Ring is designed for 6080-20/6081-20/6082-20 sanders, 6088-20 sander/grinder, 6080-20 sander, 6086-20/6089-20 grinders, 6086-20/6089-20 9" grinders, 6088-31/6089-31 7" and 9" grinders, 6088-30/6089-30 7" and 9" grinders with lock-on and 6088-20 7" grinder.