Router Circle cutter guide

Getting in to woodworking and I want to cut out circles. I suck at it with my jigsaw so I made this. Bought 1 4 foot 5/16 plain steel at home depot. Used my die set and put M8-1.25 threads on the ends (had to do it twice bent the rods). Printed the 8-32 holes on the top. Might add some side ones. There is a hole in the center that I out a 2inch 18ga nail in as a pivot point.