Ezy-Hem Gauge includes both inches and metric measurements. It can be used to make a hem from 1/4" (6mm) to 4" (10cm) on a straight edge, and from 1/4" (6mm) to 2 1/2" (6.5cm) on a curved edge. Use with steam iron, and press all hems from the fold up - Ezy-Hem Gauge eliminates ridge marks on the right side of the fabric.