Garvin 52C3-F 4" Square to Round Device Ring, Flat

4 in square to round flat device rings are used to mount light fixtures in walls and ceilings. They convert a square box to a round ceiling or wall opening with 8-32 threaded mounting tabs 2.75 in c.c. for ceiling lights or wall sconce lights. The angled slots on the covers compensate for up to 12 degrees of box misalignment on upright framing members.