Crash bars are first and foremost installed as a preventive measure, not from crashing, but from the damage resulting from a crash. In other words, a good crash bar should be able to take a hit, but with adventure-oriented two-wheelers - and the adventure bike is enjoying its heyday - they also play a role in terms of looks and image.
Because every bike is different, all crash bars are bike specific. So use the product finder to find the right one.
Crash bars can only serve their purpose when properly mounted. A measure of technical knowledge and mechanical skills seems therefore crucial. If in doubt, consult a professional.