ATTACHMENT FOR A VEHICLE AND AN ATTACHING BIKE RACK. THE RACK WAS LIGHTLY USED TO CARRY 2 UTAH TRIKES WHICH WERE VERY HEAVY. I USED TWO OF THE STRAPS SHOWN IN THE PICTURES TO ATTACH TO THE SIDES OF THE TRUNK TO PREVENT SWAYING ON CURVES. THE UTAH TRIKES WERE VERY HEAVY COMPARED TO NORMAL BIKES. I AM SURE IT COULD CARRY 4 BIKES AND PROBABLY MORE. I WILL SELL THE RACK AND HITCH SEPARATELY FOR $100 EACH BUT NO LESS. THE HITCH ALONE GOES FOR $200 ON AMAZON. FITS 2" REESE HITCH.