Durable Design: The sturdy stainless steel door handles are strong, sturdy, and durable. The knobs' sturdy design prevents breakage and chipping, which can occur with lesser-quality mortise door knobs. The chrome finish adds a stylish touch to your home or office. Application: The universal latch can be used on interior or exterior doors from 35mm to 50mm thick. The Corelong mortise lock is 60mm thick (the distance from the center of the hole to the edge of the door). They are suitable for both commercial and domestic applications. Keyed Entry Function: Locked and unlocked from the outside with a key, and the same from the inside with a matching turn knob on the rosette. Each lock comes with matching keys. It can be used anywhere extra security is desired. Installation: This door lock comes with fitting instructions. Easy installation. All fittings and accessories are supplied, including color-matched screws, a gate lock, and 3 keys. This knob set can be used for left- or right-handed