4-1/2" x 5/8"-11 Resin Fiber Disc Backing Pad

Doesn't work with milwaukee grinders with out modification.

Fiber disc for sand paper and angle grinder

The fiber disc works great with stiff sand paper discs. It does a much better job than my use of flap discs

Better than expected

Works really well and keeps the grinding disk really flat. My only gripe which is just more of a preference is the fact the backer is not threaded, where as the rubber ones we use is are which insures a square fit up to the grinder arbor. But none the less great product for a great price.