COUPLER AND PLUG - The copper core and iron connector are nickel plated steel with anodized aluminum sleeves. The steel plug is heat treated to reduce abrasion on critical mating surfaces. FLAT HEX MAIN FOLD CAN - Milled aluminum body with nickel-plated steel quick connectors for increased durability and a leak-free fit. GENERAL CONNECTION - It also allows you to be able to connect to different types of connections without changing tools and pipes. You can also work with 3 different tools at the same time. ABOUT THE SIZE - Thread: 1/4 F-NPT, size: 120*20mm/4.72*0.79in. SIMPLE OPERATION - The Pneumatic Manifold can simply thread pneumatic fittings into ports on the distribution block to produce an organized method of powering multiple lines from a single source.