Do these bolt on without drilling new holes?

Yes. They mount at factory rocker panel attachment points—no drilling, cutting, or welding. Use your vehicle's service manual as a guide for torque specs once you locate the mounting points.

Will the black finish scratch easily?

The satin finish is more forgiving than gloss, but rock crawling will eventually scuff any exposed paint. If you plan heavy trail use, consider touch-up paint or a clear protective film before installation.

Can I use these as grab handles for entering the vehicle?

They're designed as step bars with that purpose in mind, but confirm your full weight is supported before relying on them regularly. For safety, test-fit and inspect the mounting hardware after your first few outings.