Do these bolt to my truck's factory brackets or do I need to drill holes?

They mount at factory points — no drilling required. You'll need basic hand tools and fasteners appropriate for your vehicle's existing attachment points.

The finish is black powder-coat. Can I paint them or do they need prep?

The powder-coat is ready to install as-is. If you want to refinish them, light scuffing and a quality automotive primer and paint will work fine.

What's included in the box besides the bars?

You get the pair of driver and passenger bars. Mounting hardware is not included — source fasteners rated for your vehicle's weight and use.