These are standard, cast iron 4 bolt Flanges
There are several bearings that can be assembled with these housings: ie:
SA 205 and SA205 series ( locking collar), SB205 and SB205 series( set screw) singly extended inner ring bearings, flush on the other side.
UC205 series (set screw) doubly extended inner ring.
These are NOT suitable for HC205 series.
THESE ARE LIMITED TO 52MM OD BEARINGS
THIS IS THE HOUSING ONLY. NO BEARING IS INCLUDED.