DRITZ: See-Thru Dressmaker's Ruler. Use this tool for more accurate markings on your fabric projects. The tool has parallel slots for precision markings from 1/4 to 3-3/8 inches. Use this for simplifying pattern alterations, to measure and mark exact location of buttons, pockets, and buttonholes, to guide a tracing wheel and more. This package contains one 4x15 inch ruler. Made in USA.