The edge is not straight. The largest of them looks like a bracket (open or closed). I need one more so I can have a few. Maybe I can use it as a smile or a frown as needed.
Pros
Anti-slip design in use: The cork back keeps the ruler stable during use and prevents ink from getting under the stainless steel ruler, the ends of which are smooth and burr-free. There is a hole for easier hanging, convenient for storage, suitable for students and adults