Do you have several raster layers that you want to display with the exact same classified symbology? You may want to do this, so that your raster tiles look seamless. However the effort to change the class breaks and color of every raster tile can take some time. Therefore, you can set one layer up with the exact symbology you want, and then import the symbology into the rest of the layers.
Now that you have a layer file saved, we can import that layer file into any raster layer that is currently using the Classified renderer. In the Symbology tab, click the Import button, navigate to the layer file you saved. Repeat these sets of steps for each raster layer (yes unfortunately for each one).