This Sanding Tool can also be called an Extension Tool. It is 4-3/4” (120mm) long and is used to extend the 2”, 3” and 4” Hole Cutters MP21-8-2, MP21-8-3, MP21-8-4. The maximum Sanding-Extensions that can be joined together are two, for a total length of 9-1/2” (240mm), which makes it an one heckuva long extension!
You may need the Special Adapter 5/8”-11 MP21-SA-5/8” to connect the Sanding Tool to the angle grinder. The adapter does not come with it but each hole cutter does.