This Light weight and Accurate brake pad lining thickness gauge is the perfect tool for checking brake pads and to easily tell when maintenance is needed. The tool has 8 color coded gauge fins that range in thickness measurements from 2mm – 12mm. The gauge tool is assembled with a heavy duty rivet keeping all of the gauge fins neatly organized like a deck of cards. Simply fold out the size you want to use and hold it up to the pad in between the top opening or side of the caliper.