Features and Benefit: * For heavy-duty truck drums * Graduated by 0.005 and has a range of 6 to 26 * For precision measuring of drum diameters, The 8500H measures drum diameters on or off the lathe, and may be used to check out-of-roundness * Easy-to-read dials are shockproof and graduated * This model may be used with No. 9582 checking gauge.