Plastic hem ruler  10x30cm (metric)  long   Thickness:0.4mm  Seam allowance: 0.3cm & 0.7cm

Heat resistant plastic glass epoxy phenolic (FRP) up to 200 degree Celcius  thus iron safe.

These hem rulers help you make an accurate hems and turned edges.  They also work well for shaping waistbands, belts, pockets and more.