This practical ruler from Kearing is designed to make it easier to iron neat folds on your sewing projects. With one 90-degree corner and three rounded corners of different sizes, you can quickly create neat folds on patches and other items you are sewing.
I myself have often used cardboard templates that I cut out and ironed around, so when I discovered this, I absolutely wanted to try it out!
This is the first time I am ordering it, so I haven't tested it myself yet, but I have been very happy with the quality of everything else from this brand, so I am not afraid to offer it without having tried it myself, but I want to inform you that I cannot personally recommend it beyond my good experience with Kearing.
It measures 20 cm x 10 cm and can withstand temperatures of 100-200 degrees Celsius.