Allen Hitch Mount 4 Bike Car RackLocking hitch insert fits either 1 1 4" or 2" receiver hitches (2 and 3 bike models) or 2" receiver hitches (4 and 5 bike models). Patented, quick install hitch secures and tightens rack inside of receiver hitch; includes two keys. Arms fold out of the way when not in use and rack tilts back when needed. Patented individual tie down cradles secure and protect your bicycles. Accommodates a wide range of bicycle frame designs Minor assembly required. No