hitch bike rack ,                  
1.can carrier 2,3,4 bike                 
2.can fit for 1.25and 2 inch receiver bar             
3.when you not use it ,the arm can fold up              
4.when you want to open the vehicle rear door,the rack can swing a way                  
5.the arm and the receiver bar can fold up,  the carton box is very samll, so this design can reduce your shipping cost       
6.the tube of frame is 50X50X3