The STEELMAN CP1-IND 1/4-Inch Plated Steel Automotive Quick Disconnect Plug with 1/4-Inch Male NPT Threads is the answer for any home workshop or automotive garage looking to power just one more air tool. Each plug is constructed of solid steel which has a durable blue protective plating that is rust and corrosion resistant so condensation in water lines won’t cause premature failure of the tool adapter. The quick-disconnect end is sized to fit 1/4-inch couplers and fittings and the threaded 1/4-inch MPT end threads easily into tools and connectors for fast and simple setup. To make connections easier, the outer body of the plug has a hex shaped section so it can be easily tightened into tools with any adjustable wrench or an appropriately sized combination or end wrench.