The Swagman QUAD 2 + 2 offers the versatility to carry 2 bikes or attachextension to travel with 4 bikes weighing up to 45 lbs each. Simple to assembleand easy to use, the padded foam hooks using quick release triggers, snap into placequick release triggers, snap onto the frame and lock into place for addedsecurity.-Fits Class 3 - 2" hitch receiver-Can carry up to a maximum weight of 45 lbs / bike-Adjustable hooks secure frame to rack-Ratchet tire straps securely hold bikes and wheels-5/8" locking hitch pin included-Includes 2 of the same keyed locking cylinders to lock the bike-Large tire trays sold separately