RETRO FIT MORTICE KNOBS 54mm hollow brass knob This range has been designed to cover pre-existing 54mm holes. Knobs are sheet brass (with threaded spindle) and backplates are forged brass. Matching connector bolts are supplied Traditional passage door handles are designed for (generally) internal doors where no locking function is needed) Our door handle passage sets include a pair of handles plus the spindle (the square rod that passes from one handle to the other) and screws. Latches are not included as you can generally use existing latches if desired.