24x24 Steel T-Bar Drop Ceiling Diffuser with Round by Kumpelaure 3 Cone Drop Celing Vent White Outer Dimension: 23-3/4" x 23-3/4" Neck Size:8 inch The Listed size 12"x 8"

The Listed size 12"x 8" is for inside duct opening measurement

This product has listed size 8''X 8'' is for duct opening measurement only

If your duct opening size is 10” x 8”

Four screw holes and screws are included

24x24 Steel T-Bar Drop Ceiling Diffuser with Round by Kumpelaure 3 Cone Drop Celing Vent White Outer Dimension: 23-3/4" x 23-3/4" Neck Size:8 inch The Listed size 12"x 8"Upgrade your HVAC system with this high performance 3 cone ceiling air diffuser, designed for consistent airflow, easy installation, and long term durability. Ideal for drop ceiling applications, it delivers both functionality and a clean, professional finish. Innovative 3 Cone Design: Engineered for T bar, drop down, and lay in ceilings, featuring a 2 1 2" grooved collar for faster, more secure installation; compatible with optional dampers for