The From the Anvil Prestbury 50mm Mortice/Rim Door Knob Set Polished Nickel has detachable roses enabling it to be used with a rim lock or mortice lock/latch. The knobs measure at 52mm with 50mm roses and project 60mm from the door. The set comes complete with two knobs, threaded spindle and fixings. Polished Nickel Door Knobs The door knobs have a polished nickel finish and can be used internally or externally. The highly polished nickel plating is applied to the solid brass and is unlacquered as it will not tarnish.