Milwaukee® Spindle Lock Pin is designed for 4 1/2", 6" angle grinders with paddle switch with lock off, 6" rat-tail angle grinder with lock, grinder, 4 1/2" angle grinder with paddle switch, 4 1/2" and 5", 6" angle grinders with slide switch, 4 1/2", 5" and 6" rat-tail angle grinder, 4 1/2" and 5" angle grinders with paddle switch.
