Extra tooling arms for the KMG allow you to quickly change attachments by sliding the entire arm and attachment out, and inserting the next arm with a different attachment ready to go. These are a real time saver!
There are no performance differences between the Aluminum and Steel arms. Based on our testing, they run exactly the same with all of our attachments.
Here in our shop, we love using the light weight Aluminum arms because we are constantly changing attachments