Park Tool DT-3I. 2 Dial Indicator Set Brake rotors can get tricky and sometimes a bit frustrating to adjust. The Park Tool DT-3I. 2 Dial Indicator Set allows for greater accuracy and provides a reliable way to measure results. It includes a cylindrical tip that is large enough to work around voids in found in most rotors. Say goodbye to that annoying rubbing! Features Mounts onto the Park Tool DT-3 Rotor Truing Gauge Related Articles: DISC ROTOR INSTALLATION AND TRUING Manufacturer's Part No: DT-3I. 2 UPC: 763477002785 | Park Tool | Dt-3I. 2 Dial Indicator Set For Dt-3