I think Justin is mistaken, the red plate behind the blade is the insert. The table top appears to be aluminum, not cast iron. This is likely a bench top or jobsite model with a direct drive universal motor like this. I had one of these, first time I used it I decided to get rid of it. Make sure you have good hearing protection, if I'm right, it's a screamer. Please don't form an opinion about table saws based on this one, there are much better ones out there. Don't mean to be negative but hate to think you might get turned off woodworking based on your experience with this saw.