The Ideas C12047 9-degree ruler for fans or circles up to 120cm is a specialized tool that allows you to cut circular sectors and fan blocks for patchwork with geometric precision. Made of rigid, transparent acrylic with a fixed 9-degree angle, it features graduated scales that facilitate the creation of fans, complete circles, or arcs up to 120 cm in diameter. Its well-defined guide lines ensure that the fabric strips are cut with a perfect fit to form "Dresden Plate" or mill wheel patterns. It is fantastic for quilters looking to create radial effects and high-level circular quilts.