The Nora Lighting Iolite 4 Inch LED New Construction IC Housing offers an aluminum IC and airtight construction housing for minimum light leakage and maximum cost-saving ability. Features an LED driver mounted on the bracket with over 80% of energy-saving usage. The Iolite 4 Inch LED New Construction IC Housing is dimmable and includes 24.5 hanger bars with alignment feet nail and scooted for T-Bar installation.