Nora NHIC-27QAT - 6 in. - Shallow Insulated Ceiling Airtight Housing with Quick Connectors - 120 Volt Direct contact allowed; no clearances are required Housing adjusts from 5/8"  1-3/8" to accommodate various ceiling thicknesses. Adjustable socket mounting plate allows for best possible light distribution Bar hangers are adjustable from 13-5/8" to 24" and can be repositioned 90 degrees Junction box is listed for through branch circuit wiring and contains seven 1/2-in knockouts and four ROMEX pryouts with strain relief