Adjustable ball mount makes it easy for you to haul different trailers. Ball height adjusts in increments of 1" so that you can easily switch between trailers with different tongue heights. Reversible ball platform lets you swap between 2 different-size balls. Self-tension, anti-rattle Solid-Tow system tightens ball mount inside receiver tube and secures ball platform to ball mount. Stops rattle and clunk. Uses internal, stainless steel bolts for long life. Adjusts with Allen wrench (included). Ball mount is machined from a solid piece of aircraft-grade billet aluminum. Solid aluminum produces a lightweight yet strong ball mount. Avoids welds, which can cause weak points that might break. Polished finish creates a high-quality appearance. 2 Chrome-plated steel hitch balls included. Made in the USA.