Now you can easily create perfect circles, ellipses and sweeping arcs! With your router and this handy, easy-to-use jig, youll be able to make picture frames, mirrors, signs, tabletops and more in just a matter of minutes. Compare to other ellipse/circle router jigs that cost $100 more. Designed for use with just about any plunge router, the Rockler Ellipse/Circle Router Jig lets you cut circles and ellipse shapes over a wide range of dimensions and proportions. Set up takes only a couple of minutes and is virtually math-free. Using the jig is just as easy. As you move the router through the cut, the jig’s sliding dovetail mechanism keeps the router precisely on the cut line.