The Frelan Hardware JC17 Plain White Turn & Release can be used with the Frelan Hardware JC10 White Porcelain Door Knob on Rose. You will require a  mortice rack bolt with this product as it allows the bathroom turn to operate; this can also be found in the related products.   Safety Release Function This design makes it extremely safe, as the release part of this set has a practical coin slot which can be used to unlock the door from the outside in an emergency.