This 20-piece package of brass tube fittings is equivalent to Swagelok's B-810-3 model, and is designed to fit a 1/2" tube. These fittings are ideal for use in a variety of applications, including hydraulics, pneumatics, pumps, and plumbing. They are made to high-quality standards and are built to last. The fittings are brand new and ready for use in your project. They are made from high-quality materials and are designed to provide a secure and reliable connection. With this package, you can be sure that you are getting the best fittings for your needs.