The STEELMAN 99480 Industrial Style Quick Disconnect Plug 10-Pack is an answer to the workshop or garage that uses an assortment of different air tools to get projects done. Designed to fit into standard 1/4-inch NPT female threaded pneumatic inlets, these plugs are constructed of solid steel to stand up to constant heavy-duty use. Durable, these plugs can handle a maximum working pressure of 300 PSI so they can be used on the most air intensive and high pressure pneumatic power tools.