Description 20" Digital Drum Gauge | Case of 8 | JETSave Big when you buy case lot 8 per case. Only $781.80 per pair. All JET Brake and Rotor tools feature stainless steel construction for professional use The ideal method to measure wear on brake drums 0 - 20" (500 mm) range With data output interface 0.0005" / 0.01 mm increments Comes with custom wood case Increments: 0.0005" / 0.01 mm Range: 0 - 20" (0 - 500 mm) Type: Digital Drum Gauge