Universally Compatibility: Designed to work with both inverted and double 1 / 4 " brake lines, including steel, polymer coated, and copper tubing commonly found in trucks and other vehicles Complete 18 Piece set: Includes 6 adapters and 12 nut with 7 / 16 24 thread size (standard 1 / 4 " tube fitting), providing all necessary components for various brake line connection scenarios in truck maintenance Easy Installation Process: Simply clean tube ends, slide nut onto both brake lines, then connection and tighten the adapter for a professional hydraulic connection in braking systems Precisions Engineered Design: Features precisions machined threads and cone / tapered ends that ensures secure, leak proof connection when properly installed using standard wrenches Premium Brass Construction: These brake line fittings are made from brass with anti rust, offering excellent heat resistance and low properties for good in automotive braking systems, Manufacturer: Oxxggkao