Sometimes precision doesnt just exist in the form of straight lines but in curvaceous ones helixs ellipse template is one such example working as both a ruler and as a set template of ellipsesfrom big to small this template is a nifty little addition to your workboxruler measures up to 19 cm approximately 75 inches35 inch and 16 inch isometricellipses come in a variety of sizeshelix ellipses template 19 cm