Hose/Fitting Size: #6, #8, #10 (for standard hose) Material: Aluminum tube, Iron screw, Iron jacket with color zinc-plated finished Application: One side with iron jacket connects to hose, another side connects to compressor or condenser. It is made of high-grade aluminum, resistant to corrosion, and durable. Quick and easy to install, saving your time and effort. The Beadlock design of these fittings provides a tight, secure, and leak-proof connection for your A/C system.