Nora Lighting NHIC-17QAT Line Voltage Quick Connect IC Air-Tight 6 Inch IC Airtight Line Voltage Housing Housing adjusts from 5/8"  1-3/8" to accommodate various ceiling thicknesses. Adjustable socket mounting plate allows different types of lamps to be used for best possible light distribution Bar hangers are adjustable from 13-5/8" to 24" and can be repositioned 90 degrees Quick Connector providedq