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