It adapts motorhome mounted Blue Ox tow bars Aventa, Aventa II, Kar Bar, Aladdin, Alexxa, Acclaim and Blue Ox "A" frame tow bars with 1 or 3 pronged attachments to Roadmaster brackets. Also adapts Demco Aluminator, Dominator, Excalibar, and Kwik-Tow to Roadmaster brackets. Adapter is permanently bolted to the mounting bracket.