This remnant of a snapped key is about to be finally removed from the ignition barrel. Whenever the broken key extractor kit needs to be used, it is almost always dark and raining.
We use dedicated broken key extraction tools to remove snapped parts of key. Sometimes it may need 2 or 3 tools in the lock to get the part out. On occasion it will be necessary to remove the lock and strip it down to remove the broken part.
To replace the key it may be possible just to clamp the broken parts together in a trace-cutter. Or failing that the key can be read by eye or software or cut from code. In many cases it is possible to decode the lock itself. In most cases it is possible to cut a new key even if parts or all of the original key are missing.