Steelman 8-piece Manual Brake Gauge is designed to show customers and operators an accurate measure of brake lining, improving customer confidence by eliminating the question of whether a brake job is necessary. This unit also increases productivity, as its 3-color coding system is easy to read and understand (red must be serviced, yellow should be serviced, and green is good), and all pieces are constructed of 20-gauge sheet metal with a durable powdercoat finish.