This Yale 1 Star Double Profile Cylinder with a chrome finish is suitable for a variety of doors, including patio doors, bi-fold doors, residential doors, and more. It comes in a box of 20, each keyed alike with a 45/55 measurement. The cylinder is made of nickel material and is perfect for those who prioritize security in their homes or commercial properties. In addition to its functionality, this cylinder also adds a touch of style with its sleek nickel finish. Whether you have a front entrance door or a balcony/terrace door, this cylinder can fit and enhance the overall aesthetic of your property. Upgrade your door security with this Yale cylinder today.