Do these boards need drilling or welding?

No. They mount directly to factory rocker panel attachment points on your Santa Fe. Bolt them on with basic hand tools and you're done.

Will these rust if I live in a wet climate?

Aluminum resists corrosion naturally, but any bare metal edges should be sealed or touched up with clear coat after install to maximize durability in salt or heavy rain exposure.

What hardware comes in the box?

The boards and mounting assembly are included. Verify your existing factory fasteners are intact before install — if any are stripped or missing, you'll need replacements from your dealer parts counter.