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The STBM eliminates hitch noise with an advanced engineering design. It has an internal mechanism securing the shank to the receiver and the hitch ball holder to the shank, which also helps protect the ball mount from theft. This technology virtually eliminates the clunk and rattle associated with other ball mounts, and provides a quiet, enjoyable ride. 1,000 lbs tongue weight10,000 max trailer weightDual hitch balls (2? and 2-5/16? combo)2? shank sizeAircraft-grade aluminum and stainless steel constructionLimited one year warrantyMade in the USA