ABN Brake Lining Thickness SAE & Metric Gauge 8 Piece Tool Set Color coded to identify SAE & Metric thickness on brake lining examination Each blade has both SAE and Metric measurements Metric sizes Green 8mm, 10mm, 12mm; Yellow 4mm, 5mm, 6mm; and Red 2mm, 3mm SAE sizes Green .3150 to .4724, Yellow .1575 to .2362, and Red .0787 to .1181 Constructed out of ABS plastic for extra strength and durability