Quilt & Sew See-Thru Ruler by Dritz
Accurately position and mark your needlework this 18 x 2-inch transparent plastic ruler. It comes with 0.05-inch grid markings and 0.5-inch spaced holes for centering patterns, drawing parallel or perpendicular lines to redesign patterns. Use it for drafting quilt blocks and designs or adding seam allowances, enlarging patterns, drawing circles, scallops and more.