EK Circle cutting tool
I have various tools for cutting circles - some very expensive - but the Scissor Pro is a hundred times better. It lets you be very precise with the size circle you want, it is not awkward or cumbersome, it's quick to get out, cut and put away again. You put your paper under the frame, put the ingeniously safe cutter in the slot, and run it around the circle. Done! Extra blades come with the tool and store in the cutter.