That's pretty much all I used for my gripframe/tray/body diet.. I tried other bits, but those, especially the one on the right, were the tools to use. But be carefull.. I ****ed up on my last hidden cut, the dremel thing that holds the bit slacked slowly, and the bit got slowly inside, getting shorter, and the rotating head of the dremel touched the body
At least it's on the edge against the tray/gripframe assembly so it's not a lot visible.