The Draper 99977 Brake Pad Thickness Gauge allows brake pad wear to be measured quickly The Draper 99977 is an 8-blade thickness gauge for quickly measuring wear and assessing remaining life of brake pad linings. The offset blade is inserted between the brake disc and the brake pad backing plate. Each of the eight blades is conveniently marked in both metric and imperial units and are colour coded to quickly signify levels of wear: red for replace now, yellow for replace soon and green for okay. Display packed. Features: 8-blade plastic gauge to quickly measure brake pad wear Metric and imperial units and colour coded for easy assessment of remaining life Comes with: Red blades: 2 and 3mm Yellow blades: 4, 5 and 6mm Green blades: 8, 10 and 12mm Specifications: Blade Length: 127mm (approx.)