[MAKE BRAKE PAD MEASUREMENT EASY] - Brake Lining Thickness Gauge is a super quick way to check if you need to get brake pads.Simply place of each brake gauge on the pad until the gauge matches the thickness of the pad. , no need to pull out a micrometer to do some math. If the meter is green, you are good. If it's yellow, it's time to start thinking about a replacement. If it's red, it's time to install some pads. [PREETY DUARABLE AND HANDY] - The Metal brake lining gauges is made out of metal-Steel. It is a really Heavy duty product that we use in a professional repair facility.The brake lining measuring tool made of metal not plastic does not easily bend. Easy to storage in your tool chest. [COLOR CODED& SAE & METRIC] - Green:[12mm(0.4724inch),10mm(0.3937inch),8mm(0.3150inch)]; Yellow:[6mm(0.0.2362inch),5mm(0.1969inch),4mm(0.1575inch)]; Red:[3mm(0.1181inch),2mm(0.0787inch)];Green=Good, Yellow=time to replacement, Red=Worn down, time to replace. [DRIVE SAFELY] - Professional and accurate detection of Brake Lining Gauge Set allows car owners to replace the brakes with confidence Green=Good 12mm(0.4724inch) 10mm(0.3937inch) 8mm(0.3150inch) Yellow=Time To Replacement 6mm(0.0.2362inch) 5mm(0.1969inch) 4mm(0.1575inch) Red= Worn down, Time to Replace 3mm(0.1181inch) 2mm(0.0787inch) Color coding makes it easy to determine when you should replace your pads. Heavy duty, not easily bend. Color Coded/SAE & Metric//Heavy Duty Brake Lining Measuring Tool Colour:As Shown Material:aluminium alloy Package Contents: 2 x Brake Pad Thickness Gauge Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.