Architectural quality UK manufactured by Imperial locks and latches made to BS EN 1634-1. Heavy duty tubular mortice latch. latchbolt operated for door knobs either side and compatible with our glass knobs. Light sprung as standard, heavy duty springing on request. Supplied in satin brass or stainless steel. Lock face can be plated in any of our finishes including polished or satin nickel, chrome, bronze, antique finish to match door knobs. The basket measurement is the centre where the spindle is fitted. If you need advice please contact us. Other sizes available please enquire. If you have pre-bored doors with a hole please contact us for an adapter.