Describe Extent of Raster Outside of ArcMap

Greetings,

I'm trying to understand the help files, and I am seeing that using arcpy.Describe(object) applies to layers.

What I'm trying to do is loop through a large folder of raster files outside of ArcMap and grab their extent. My first thought was to use the Describe method, but if it applies only to layer files, that means I'd have to create a layer file (temp or not) for 900+ rasters, which is not ideal.

Is there any other method I could use that doesn't involve geoprocessing to grab the extent of raster data sitting in a folder outside of ArcMap using arcpy?

Thanks,

Colin