Do you want to install a SureFlap pet door in a glass door? This brown mounting adapter is designed specifically for this scenario. It fits existing circular holes from 212 mm to 260 mm in diameter, has a total diameter of 285 mm, and consists of two parts for a structured installation. Reserved for indoor use and intended for adult cats, it completes your installation without compromise. Hand-washable, its daily maintenance remains simple. A one-year manufacturer's warranty on parts accompanies the product.