The Blue-Point YA2780 Brake Resetting Gauge is a vintage mechanical measuring tool designed to set the precise clearance between drum brake shoes and the inside diameter of a brake drum prior to reassembly. Key Details & FeaturesFunction: Measures the inside diameter of the brake drum using the outer side of the gauge, then locks the measurement to transfer and adjust the brake shoes on the opposite side. Compatibility: Fits drum brakes ranging from 6-1/2" to 13-1/4" in diameter for foreign and domestic automobiles and light trucks. Build: Heat-treated, chrome-plated steel featuring both inch and metric calibrations with a positive locking mechanism. PRE-OWNED IN GREAT CONDITION