Do these mount at the factory roof points, or do I need to drill holes?

They mount at factory roof attachment points — no drilling needed. Your vehicle already has the mounting locations built in.

What can I attach to these crossbars?

These provide the base structure for roof-mounted accessories like cargo carriers, bike racks, ski racks, and roof boxes. Your specific carrier or rack will attach to these crossbars.

Will these work with aftermarket roof boxes or carriers?

Yes, as long as your carrier or box is designed to work with standard crossbars. Check your rack or box instructions to confirm compatibility with crossbar-style mounting.