These are standard, cast iron 4 bolt Flanges
There are several bearings that can be assembled with these housings: ie:
SA 204 and SA204 series ( locking collar), SB204 and SB204 series( set screw) singly extended inner ring bearings, flush on the other side.
UC204 (set screw) doubly extended inner ring.
These are NOT suitable for HC204 series.
THESE ARE LIMITED TO 47MM OD BEARINGS
THIS IS THE HOUSING ONLY. NO BEARING IS INCLUDED.