Circular hit and miss vents available in 4 sizes: 100mm, 127mm, 152mm and 177mm Diameter. Hit and miss refers to the open/close design. Vents can be closed to restrict air flow. Ideal for airing cupboard, boiler room doors etc. Available in over 20 metal finishes such as antique brass, dark bronze and polished brass unlacquered. Can be used on walls or doors. Manufactured from high grade solid brass. Made in England.