The Dana Dolly Original Track End works with any standard size pipe from 1 1/4" to 1 1/2" (1.66" O.D. to 1.9" O.D.) or tubing of the same O.D. Will work with both "Baby" 5/8" Pin, and "Junior" 1 1/8" Receiver stands, however Junior stands are recommended. The Track Ends are made of Steel and A...