Size is "Size x TakeUp". Overall Length is with ends in closed position. The inside of the take-up is the rectangle inside the frame through which the threaded rods can be seen.
Meet Federal Spec FF-T-791B
                    Unit of Measure
                    
               
        
            | Units Per Package | N/A 1 | 
| Size | N/A 5/8" x 6" | 
| Overall Length | N/A 15-1/2" | 
