Specifications;
1. Material

Aluminum: Lightweight, corrosion-resistant, strong.

Stainless Steel: Very durable, rust-resistant, heavier than aluminum.

ABS Plastic: Lightweight, cost-effective, sometimes reinforced with metal.

2. Dimensions

Length: Usually depends on car size; ranges from 1000 mm to 1800 mm.

Width/Height: Typically 30?0 mm in width and 20?0 mm in height.

Crossbar Distance: Some roof rails allow adjustable crossbars to accommodate different load sizes.

3. Load Capacity

Maximum Load: Usually between 50 kg to 100 kg depending on the car and rail type.

Dynamic Load: Weight limit while the car is moving.

Static Load: Maximum weight the roof can hold while stationary.

4. Mounting Type

Flush Rails: Integrated into the car roof, low profile.

Raised Rails: Stand above the roof for easier attachment of crossbars.

Side Rails / Track Rails: Run along the sides of the roof, sometimes with adjustable feet.

5. Crossbar Compatibility

Supports attaching roof racks, bike carriers, cargo boxes, or kayak carriers.

Often uses standard T-slot or U-bolt mounting systems.

6. Finish & Coating

Powder Coated: For corrosion resistance and aesthetic appeal.

Anodized Aluminum: Scratch-resistant and durable.

Painted: Usually black or silver to match car aesthetics.

7. Aerodynamics

Designed to reduce wind noise and drag.

Some have airfoil shapes to minimize turbulence.

8. Weight

Lightweight designs usually between 2? kg per rail.

Material choice affects weight.

9. Color Options

Typically black, silver, or car body-matched colors.

10. Safety & Standards

Must comply with automotive safety standards (ISO or local regulations).

Properly installed rails distribute load evenly to prevent roof damage.