WHat are these holes for?

[clavius]

I don't specifically know about those Ryobi saws, my old Makita portable did have threaded holes on the underside that you could use to mount a router to the bottom of the table. . I had to adapt my Craftsman router to fit by drilling a couple of holes in the base, but it worked ok for the limited need I had. I had to make a couple of small raised panel style doors and they did not come out too badly for a hack woodworker like myself.