The STEELMAN 97847-5PK 2-Piece Brake Lining Thickness Gauge, 5-Pack is perfect use for both in the professional garage / workshop and or for the DIY home mechanic who wishes to have a set on hand in multiple locations. Suitable for use on both disc and drum brakes, these durable 15-gauge sheet metal measurement tools are color coded with a durable yellow or red powder coating that won’t wear off to give a quick visual reference point on the status of your brake pads. The long measuring blade tips can fit into spaces most digital micrometers and calipers cannot to help you determine how much friction material remains on your brake pads. Each blade has its size stamped into the metal in metric as well as decimal SAE scale so you can tell with a glance a numerical value for the amount of pad you have left. The yellow tip measures 0.1575-inch (5/32-inch) / 4mm and the red blade tip measures 0.0787-inch (5/64-inch) / 2mm. Pack contains 5 individual sets of thickness gauges.