Receiver Tubes from Buyers Products are available in a variety of lengths, dimensions, and finishes to match your towing needs. The 2, 2-1/2, and 3 in. tubes have a cast steel collar. All tubes feature a solid stress collar opening. The 2, 2-1/2, and 3 in. tubes have a 5/8 in. hitch pin hole. Available in the following lengths: 6", 8", 10", 12", 18" and 24" (new).