IHI1415 Features: * The diameter range is 6-1/2" to 14-1/4", calibrated into 1/32" (1mm)increments * Sets the proper clearance between brake lines and drums * Brake Resetting Gauge Assembly Instructions: * The tool has a locking knurled knob to keep measurement accurateThis quality tool is used to set the proper clearance between brake lining and the drum prior to assembly. Inside calipers measure drum diameters and outside calipers transfer the measurement to the brake shoes. A knurled knob locks the tool at measurements. Its diameter range is 6-1/2" to 14-1/4", and is calibrated into 1/32"(1mm)increments. Warranty: * Lifetime warranty does not cover abuse