Features: Trustworthy quality: Our baseboard diffuser 18 inch is made of quality steel, the material is hard and strong, which is convenient and practical, the overall structure is stable, can maintain your long term use. Delicate design: Our baseboard register is designed for daily ventilation, and it can be adjustable, you can easily control the airflow according to your need. Specifications: Material: steel Color: as pictures show Duct opening size: 18 inches Package includes: 2 x Baseboard register vent Notes: Manual measurement, please allow slight errors on size. The color may exist a slight difference due to different screen displays.