This compact and handyÂ template from Westalee allows you an easy way to make half circles and more from 0.5, 1, 1.5, and 2 inches in size. Each concave/interior half circle is marked at the half and quarter circle positions. The template can be repositioned to make a complete circle. There are no removable bits to lose and you get 4 sizes in one compact 4x4 inch square.
Two thicknesses are available: 3mm for low shank machines and 4.5mm for higher shank machines.