DRITZ-Quilter's See-Thru Drafting Ruler. For quilters, sewers and crafters. Ideal for drawing patchwork and applique patterns, for enlarging and altering patterns. Featuring 1/8in grid lines that make it easy to draw parallel and perpendicular lines, 1/16in markings around outer edges and holes for drawing perfect circles with a 17in diameter and scallops. Ruler is 2x18 inches with end to end measuring and center measuring markings. Clear flexible acrylic ruler with blue markings.