Material: Square air vent cover is made from pp material, ensuring longevity and resistance to wear and tear in bathroom environments Easy Installation: Features a classic spiral panel with a snap-in spring design, making installation more convenient and easy Feature: Bathroom ceiling fan grille cover fits greatly for square ceilings or wall-mounted exhaust fans, bathroom fans, and ventilation fans, which can also be used as air diffusers or Ceiling air diffuser Versatile: Ideal for use in integrated bathroom ceilings, offering efficient ventilation while maintaining a sleek and modern aesthetic Application: Square air vent cover can be installed in ceilings, walls or ducts and is widely used in living rooms, bedrooms, kitchens, or bathrooms, as well as office environments or factories, helping to regulate airflow Specification: Material: PP Size Chart: Type A: 24.5cmx24.5cm/9.65inchx9.65inch, 20cmx20cm/7.87inchx7.87inch, Inner Hole: 7.5cm/2.95inch Type B: 24.5cmx24.5cm/9.65inchx9.65inch, 20cmx20cm/7.87inchx7.87inch, Inner Hole: 9.5cm/3.74inch Type C: 31cmx31cm/12.20inchx12.20inch, 25cmx25cm/9.84inchx9.84inch, Inner Hole: 9.5cm/3.74inch Type D: 31cmx31cm/12.20inchx12.20inch, 25cmx25cm/9.84inchx9.84inch, Inner Hole: 14.5cm/5.71inch Type E: 34cmx34cm/13.39inchx13.39inch, 28cmx28cm/11.02inchx11.02inch, Inner Hole: 19.5cm/7.68inch Package Includes: 1 SetSquare Air Vent Cover Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.