These chocks wedge against and secure the corners or sides of your gear to prevent movement and rattling. Adjustable along the slats to resize and fit a variety of gear like the SBOX031, SBOX001, RRAC159, CHAI007, and water tanks. Secures to your rack using Eye Nuts and supplied hardware. Eye Nuts create lashing points to secure cargo using STRA034* *Note: Purchase Wolf Packs, Cub Packs, Stratchits etc. separately.