The ABN Brake Lining Thickness SAE & Metric Gauge 8 Piece Tool Set, of Solid Steel is a must have for the professional mechanic or the DIYer. Each piece is 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 from steel for extra strength and durability.