Big bits can really vibrate

I had the same problem with a brand new router bit from Rockler.
I kept it in its original package for several years.
When I wanted to use it, I found a small piece of carbide inside the envelope.
I never used the bit.

kywoodchopper

I get the impression from the picture that the bit isn't very large at all. But it is a good reminder to slow the speed down based on size of the bit. A reference that can be used is:

From Rockler's website

Router Bit Diameter Maximum Speed



Up to 1" 22,000 - 24,000 rpm

1" to 2" 18,000 - 22,000 rpm

2" to 2-1/2" 12,000 - 16,000 rpm

2-1/2" to 3-1/2" 8,000 - 12,000 rpm

Remember, that's just a reference; Always follow manufacturers recommendations and the sage advice that if something doesn't feel like it's working right, there's a good chance that it isn't. Better yet, pick up a Router Book and get to know your router inside and out.