Easy to replace heating and air conditioning vent register. Two piece construction allows for easy removal and cleaning. 360 degree rotation adjustable register for roof A/C.• Shape: Round• Mounting Location: Ceiling• Diameter: 4 Inch• Length: Not Applicable• Width: Not Applicable• Color: White• Material: Plastic• With Damper: No Perfect To Enhance Your Comfort & Safety Comes With Installation Hardware | Valterra Heating/ Cooling Register