The Inno IN551 Bar End Hook is a clever little device that mounts to the end of a roof rack crossbar and makes it so you can hang your wetsuit, towel, clothing or just about anything else you may not want on the ground when you’re suiting up or stripping down. Mounts to Inno multi-purpose base rack load bars and Thule square bars only. Not compatible with factory rack crossbars. Simply insert into end of crossbar. Inno IN551 Bar End Hook extends out when you need it and retracts back when you don"t. Genius!