Heavy-Duty Anti-Rust Aluminum: This roof rack cross bar is built with one-piece aluminum that resists rust and deformation. Reinforced with internal ribs for durability without adding unnecessary weight to your vehicle Anti-Theft Metal Locks: Made from upgraded materials with anti-theft lock system and 2 keys. Once locked, the bars won’t loosen or shift. Mounting feet are made of PP, rustproof and resilient Low Wind Noise: This car roof rack cross bars set features an aerodynamic aluminum tube design that helps reduce drag and noise, ensuring a quiet ride for both you and your passengers 165 lbs Load Capacity: Our roof cross bars greatly expand rooftop cargo space, ideal for carrying brackets, cargo boxes, surfboards, bikes, and more. Note: Max speed 80 km/h (50 mph). Use windproof covers or safety nets for large items Vehicle Fitment: This cross bars roof rack fits most vehicles with a bare roof. Compatible inner rain gutter spacing: 43.3–44.5 inch / 1100–1130 mm; adjustable hook range: 49.2–56.3 inch / 1250–1430 mm.