Do these require drilling into the rocker panel?

No. These mount at factory attachment points using existing bolt holes — zero drilling, zero welding. Your rocker stays completely intact.

Will the black finish hold up to road salt and winter weather?

Anodized aluminum is built for that. The finish is much more corrosion-resistant than painted steel — you won't see rust or peeling after a few seasons of exposure.

What tools do I need to install these?

Basic hand tools — socket set, wrenches, and a torque wrench to spec out the fasteners. Refer to your vehicle's service manual for proper torque values on the factory attachment points.