Will these spikes stay tight while driving?

The spikes are removable by hand design — they're meant to pull off easily when you want to change the look. Once installed, they should stay seated, but verify a tight fit before highway driving and check them after your first drive.

Do I need a special tool or key to remove the spikes?

No — these pull straight out by hand or with light finger pressure. No special key or tool required.

What if one of the spikes cracks or gets lost?

Spikes are removable, so you can keep running the nut smooth without it. Replacement spike availability would depend on the manufacturer — contact support with your purchase order if you need a replacement.