Descriptions: The brake gauge tool was designed to give customers an accurate measurement of how much brake lining is left Most state agencies requlre that the customer be notified of how much brake lining is left in order to suggest that the lining should be replaced The technician must reference to the oem manufacturer specifications to determine if the lining is worn below minimum specifications Specifications: Material: Metal Red: 2, 3mm (0.0787", 0.1181")-Bad Yellow: 4, 5, 6mm (0.1575",0.1969",0.2362")-Dangerous Blue: 8, 10, 12mm (0.3150",0.3937",0.4724")-Good Quantity: 1 Set Note: 1.Transition: 1cm=10mm=0.39inch 2.Please allow 0-3cm error due to manual measurement. pls make sure you do not mind before you bid. 3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 Set x Thickness Gauge