I've never used a router in my life and I was lucky enough that my brother is letting me borrow his to cut the slot for the t-molding but I had a few questions first. I searched and searched and ran across some people saying that different size slots were needed and honestly I just ended up more confused and unsure of exactly what I need to get this part of my build done right.
First, I have my side panels cut out and upon closer inspection I can see some wobbly cuts I made so I wanted to get both panels clamped together and run what I believe is called a flush cut bit along the outside of the panels to make sure I have an exact match. The problem being that I have never used a router and am not quite sure what bit I need to use and if I even have the correct bit or if I need to purchased one. Here is a picture of the bits my brother sent with the router.




Second, I'm using 3/4" MDF for my build and I see multiple 3-wing slot cut bits on t-molding.com's website, which one will I need for my build? I'd rather not be hot gluing the entire length of tmolding after buying the wrong bit if I can make sure I get the correct bit for my application.