A great time saving tool and essential for any garage. These gauges are ideal for quick and easy confirmation of the road worthiness of brake pads. The offset gauge is inserted between the brake dis and pad. The blade that sits most snug is indicative of the wear on the pad. The set includes three colours which denote the level of wear. Red: Pad should be replaced immediately. Yellow: Pad is becoming worn. Green: Pad is in good working order. Contains: RED: 2 & 3mm. YELLOW: 4, 5 & 6mm. GREEN: 8, 10 & 12mm.