HOT IRON RULER

 
 

   Hot Iron Ruler is a durable high temperature-resistant resin plastic making it perfect to measure, mark, fold, and press: deep hems, long hems, miter corners, curved edges, and more. 
 
 
 
 
 

   Its unique non-slip surface helps hold the fabric in place, offering better management of small edges or when working with delicate fabrics.  
 
 
 

   Comes in 2 sizes. 8 and 12 inches  
 
 
 

   Not my video but is good to show how to use this ruler.  
 
 
 
 
  https://youtu.be/BE-9xNTEufM