Park Tool 2197 DT-5/DT-5.2 Diamond Abrasive Adaptor for Carbon FiberPark Tool 2197 DT 5 DT 5. 2 Diamond Abrasive Adaptor for Carbon Fiber. The 2197 is an add on accessory for the Park Tool DT 5 and DT 5. 2 Disc Brake Mount Facing Set to enable easier and more efficient facing of disc brake mounts on carbon fiber frames. Features a brazed on diamond grit surface that is over 100 times more durable and effective on carbon fiber than the cutter included with the DT 5. 2. The 2197 sits between the cutter of the DT 5. 2