Will these fit my current ratchets and sockets?

Yes. The drive end accepts both ¼-inch and ⅜-inch socket attachments, so they work with standard ratchets you likely already own.

Can I use these on brake lines without damaging the fitting?

Crowfoot wrenches are designed exactly for this — the open-end wraps around the nut instead of gripping from above, which prevents rounding soft brass fittings common on brake and fuel systems.

What if I need a size not in this set?

This set covers the most common flare nut sizes found on fuel lines and brake systems. Individual crowfoot wrenches are available separately if you need additional sizes outside the 8–24mm range.