This SBPF208-24 bearing is in a stamp steel housing ready to be installed. This housing is thinner than the cast iron housing and more affordable. There are 3 square holes on the outer part of the housing for installation. The bearing itself has a set screw to hold the shaft in place after mounting.
Here are the specs of the SBPF208-24 Pressed Steel Housing Bearing 3-Bolt Flanged Mounted: