The perfect tool for drafting! Don't let the name of this tool fool you - this dressmaker's dream ruler measures 2 inches by 18 inches with 1/8" printed grid and 1/16" markings around outer edge. Perfect for adding seam allowances, creating right angles (wait, did someone say 'grainlines') and to boot, marking centers and drafting circles and scallops with the addition of pierced holes every 1/2 inch. Made of flexible plastic with added instructions for use on the back of the packaging. Now how's that for magical. A lifelong friend, don't be caught drafting without it!