Durable Design: Heavy duty stainless steel door handles allow them to be strong, strong and durable. The sturdy knob design prevents breakage and breakage which can occur with less quality mortise door knobs. The chrome finish adds a stylish touch to your home or office. pApplication: The universal latch can be used on interior or exterior doors from 35mm to 50mm. thickness. Corelong 60mm mortise lock (the distance from the center of the hole to the edge of the door). They are suitable for commercial and domestic applications. pKey entry function: locked and unlocked from the outside with a key, and the same from the inside with an associated rotary knob on the rose. Each lock comes with matching keys. It can be used anywhere extra security is desired. pInstallation: This door lock comes with fitting instructions. Easy installation. All fittings and fittings are supplied including color matched screws, a gate lock and 3 keys. This knob set can be used for left or right doors.