Milton®'s 8-piece Brake Pad Gauge allows you to quickly measure the external & internal brake pads to help identify if a vehicle has a sufficient amount of brake pad lining. This brake lining gauge is uniquely designed with an easy-to-use and readable color-coded scale. Red = Replace, Yellow = Caution, Green = Safe. Manufactured from durable lightweight aluminum, it's a brake pad gauge to ensure long-term performance and constructed to be compact and calibratable for portable ease. Reads the following metric/SAE sizes: 2mm (0.0787 inches), 3mm (0.1181 inches), 4mm (0.1575 inches), 5mm (0.1969 inches), 6mm (0.2362 inches), 8mm (0.3150 inches), 10mm (0.3937 inches), and 12mm (0.4724 inches). Milton® provides top-of-the-line solutions to all pneumatic automotive service applications.