This is a set of 10 round clear drill weep vents, perfect for use in refurbishing cavities, retaining walls, and rendered surfaces. The vents are made by MSA Motorsport, a well-known brand in the building materials industry, and are manufactured in the United Kingdom. The unit type is a unit, and the country/region of manufacture is the United Kingdom. The vents come in a pack of 10, making them a great choice for large projects. They are ideal for use in other building materials, building materials and supplies, and business, office, and industrial applications.