Sealey VS040 Brake Drum Wear Gauge Measures drum wear to ensure it is within manufacturer?s tolerance. Also aids quick set-up of shoe/drum clearance prior to re-installation of drum. Measures drums from 165 to 292mm (6-1/2" to 11-1/2"). Dual Imperial and Metric scale. Knurled locking action. Measures drum wear to ensure it is within manufacturer?s tolerance Aids quick set-up of shoe/drum clearance prior to re-installation of drum Measures drums from 165 to 292mm(6-1/2" to 11-1/2") Dual Imperial and Metric scale Knurled locking action Model No VS040