Did not receive what was shown!!!!!!!!Got a flimsy, cheap, uneven piece of plastic.

The inside piece wobbles a little so the circles and lines made using those guides don't always come out quite right, but otherwise this is a really good piece of equipment.

The inside piece wobbles a little so the circles and lines made using those guides don't always come out quite right, but otherwise this is a really good piece of equipment.

The inner piece is kind of loose, giving room for error in measurements.

But once you know how to manipulate the inside piece, it works.