This complete set includes an external cylinder, an interior anti-knob, and a matching interior ball to meet your door protection and application needs : Handles, cylinders and knobs all come with standard mounting dimensions and do not require additional openings so they are suitable for most wood doors and anti-theft doors It features round or modern square handle designs in a matte black finish and is perfect for a variety of home decor styles to enhance your aesthetic appeal Simply press to open the door and lift it up for easy operation, perfect for entrance doors and interior doors Made of high strength metal alloy, the set has excellent wear and tear resistance, Manufacturer: Tertioi