Fitment: Fits for most roof racks, cargo cages and all awning size. Can be installed in the inverted or vertical position for square bar and heavy bar. Dimensions: 50mm Wide Compatible: Compatible with for profession bar, wing bar, Aero bar, heavy duty T-bolts and grooved nuts. Fitment: Fits for SquareBar, for heavy duty bars in either the inverted or upright position. Compatible with ProfessionalBar, for WingBar, for AeroBar, for heavy duty T-bolts or Channel nuts Function: To provide additional strength when awnings are mounted to roof bars on vehicles used off road or under extreme conditions, Manufacturer: Littimoon