8 PIECE COLOUR CODED FOR EASY IDENTIFICATION• Most state agencies require that the customer be notified of how much brake lining is left in order to suggest that the lining should be replaced. • Brake gauges give an accurate measurement of the amount of brake lining is left without guess work • Made from 20 gauge sheet metal with durable powdercoat finish Brake Gauge Set • Red: 2mm, 3mm (Pads must be replaced) • Yellow: 4mm, 5mm, 6mm (Replacement recommended) • Green: 8mm, 10mm, 12mm (Brakes are in good and safe working range)