These are .PNG files. They are exact sized scans of Kahler mounting plates, routing templates, routing schematics and adapter plates. You can cut them out and see if the bridge you want, will fit your situation.  The best way to accurately retain the correct size is to save it to your desktop, open and print it with no "scale" or "crop to fit" options set. To start: Right click the desired picture and "save as" to your desktop. Now right click the picture that you saved to your desktop. Choose "Open with" and choose "Paint".  The printed size should be the same as the original scan. You should use the measurements on the routing schematic page to verify the print did not resize the scan in any way. If it did, you can readjust the printer or cutout the template according to the measurements on the template or if it is close you can simply use your judgment and compensate accordingly. Measurements are in "thousands of an inch" and "metric". The measurements are not written out in fractions because fractions do not have enough increments between them to measure accurately.