Rage Powersports BC-7821-3K 3-Bike Towing Clamp Style Bicycle Rack for 2' Class III/IV Ball Mount Receiver Tubes Clamps on a 2" x 2" Class III/IV ball mount receiver tube allows for towing, does not obstruct ball mount Requires at least 1.5" clearance between the vehicle bumper and hitch receiver tube lip Includes (2) tie-down straps with rubber coated hook ends secures the rack to a tailgate or hatch Handle operation with lock-pin, folds compact for storage Steel tube construction with a black paint finish