Milwaukee® Spindle Lock Tube is designed for 4 1/2" angle grinders, 4 1/2" and 5" and 6" angle grinders with slide switch, 4 1/2" and 5" and 6" angle grinders with paddle switch, 4 1/2" and 5" and 6" rat-tail angle grinders, 4 1/2" and 5" and 6" rat-tail angle grinders with lock, 6" and 4 1/2" and 5" angle grinders with paddle switch, lock-off and cordless 18 V 4 1/2" cut-off/grinders.