The concept for these adapters was developed by a German instrument maker whose name, Luer, still defines this unique design. The Luer taper allows the rapid connection of medical devices and tubing in a mechanically secure and leak proof (liquid) manner. However, the mated parts disconnect easily and when desired. Used on most hypodermic needles, Type 316 Stainless Steel Luer Connectors are truly superior fittings suited for the most demanding medical and laboratory applications. The barbed fitting can be used with many types of tubing, such as Teflon, Polyethylene, PVC, etc. Luer blanks give you the added option of customizing the fitting to meet your specific mounting requirements. Outside diameters of barbs have a tolerance of + / -0.005 inches. Fittings are threaded for a more secure connection and added leverage for seal disconnect. Lend versatility to a Luer Connector based fluid transfer system. They also can be used as extensions.