Manufactured in their factory in England, this product is delivered ready-to-fit, crafted from aluminium; it prevents various-sized animals from gaining entry which can cause various issues, some costly. This product does come with a stainless steel strap which is used to fit the product around the chimney and flues, suitable for sizes between 150mm to 250mm (6 inch to 10 inch) internal diameter.
It it advised that you have your chimney or flue inspected by a professional chimney sweep; alongside that, it's recommended to have a professional inspect your chimney system to determine what product is most suitable.