How to measure a strut back frame
All of our measurements are taken from the inside of the frame, meaning all measurements listed are to take, for example a 12×10 frame fits a 12×10 insert.
When measuring for a frame, your insert should be the same size as the back of the frame, as shown here.
All our measurements are listed Height x Width, on a Portrait basis. However, they can be easily turned on their side to become Landscape; if so, keep in mind to invert the measurements to Width x Height.