Front Runner Adjustable Rack Cargo ChocksProduct Description Front Runner's Adjustable Rack Cargo Chocks can be used to brace and secure a variety of gear on a Front Runner Rack. 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 Wolf Pack, Cub Pack, Typhoon Bag, Expander Camping Chair, and water tanks. Secures to your rack using Eye Nuts and supplied hardware. Eye