Oversize ring for 4" E-Series Round LED Downlight. Covers ceiling cut-outs up to 5-1/4"Compatible Luminaires:NEFLINTW-R4233: 4? E-Series FLIN LED Round Downlight (2700K/3000K/3500K)NEFLINTW-R4345: 4? E-Series FLIN LED Round Downlight (3000K/3500K/4000K)