At One Click Purchasing, we are your reliable source for the NSN part 21544-4 manufactured by Trio Laboratories Inc. We carry a wide range of popular NSN items on our website, including Screw Cap Socket He like part number 21544-4 which is listed with the NSN 5305001934244 for easy identification. If you are interested in 21544-4 item, then take the advantage of our online RFQ service, or peruse our website as you see fit to find other items of interest that you may wish to learn more about.