Small adapter with diamond grit. For calibrating disc brake mounting surfaces on PostMount and FlatMount standard carbon forks and frames (also for carbon-alloy-aluminum combination cases). Not recommended for use on pure aluminum, steel and titanium frames.
Compared with standard cutting tools, the material used makes it 100x more durable. When grinding, use water instead of cutting fluid. A DT-5 or DT-5-2 kit is essential for use.