Our unique and patented Ball & Socket top fittings not only look amazing, but we build them to last a lifetime. Designed with boaters in mind, our Ball & Socket fittings are easy to install and manufactured from only the highest-quality Type-316L polished stainless steel. The Delrin insert eliminates rattling, provides smooth operation and enables a full range of motion. Our full line of Ball & Socket top fittings fit standard tube sizes.