This CURT Switch Ball trailer ball set comes with two ball attachments. Ball 1 features a ball diameter of 1-7/8" and ball capacity of 3, 500 lbs. Ball 2 has a 2" ball diameter and a ball capacity of 6, 000 lbs. Ball 3 has a 2-5/16" diameter and a ball capacity of 8, 000 lbs. The shank measures 2-1/4" long and 1" in diameter. These interchangeable hitch balls are constructed from premium-grade steel for strength and give them a bright nickel-chrome finish for a long life. To ensure your safety and provide you with a tow ball you can depend on, CURT Switch Balls are independently tested in accordance with SAE J684. | Curt Switch Ball Trailer Ball Set (1-7/8", 2" & 2-5/16" Balls, 1" x 2-1/4" Shank) #42225