The milwaukee hd18 sg 0 25mm cordless die grinder is ideal for the reaming of lock cylinders and for grinding hard to reach places it has a 2 step speed control and red link electronics provide proctection against overload for long life of the battery motor and gearbox it has a long slender spindle neck design for working in hard to reach places and a slim and sturdy metal gear housing design making it comfortable and easy to hold specifcation no load speed 1750021500min maximum wheel diameter