8 Pairs of 55mm Solid Brass Beehive Mortice Door Knob Pair In A Polished Brass Finish. Projection of Knob (from base plate): 80mm. Suitable for doors up to 40mm thick. These solid brass door knobs are unlacquered. This means that these knobs will darken and develop a patina over time. These can be polished to regain their original shine. Please ask for carriage costs to. Channel Islands, Northern & Southern Ireland, PO Boxes and British Forces Post Office locations.