Receiver Tubes from Buyers Products are available in a variety of lengths, dimensions, and finishes to match your towing needs. The 2 in. and 2-1/2 in. tubes have a cast steel collar. All tubes feature a solid stress collar opening. The 2 in. and 2-1/2 in. tubes have a 5/8 in. hitch pin hole while the 1-1/4 in. tubes have a 1/2 in. hitch pin hole.