(Note: Measurements are outside max. dimensions unless stated otherwise).19th Century : Decorative oval spiral fluted door knob with raised concentric ring tiered backplate.Option :Four 3/4" No 4 slotted countersunk steel screws.Height including backplate 88mm. (3 1/2")KNOBDiam. 50mm. (1 15/16")Height of spiral section 49mm. (1 15/16")BACKPLATEDiam. 57mm. (2 3/16")SPINDLE :Length to suit maximum door thickness 76mm (3")One plain 8mm (5/16") square spindle supplied per pair or if odd numbers ordered.A discreet threaded disc inside the base permits the backplate to be screwed tight, allowing the knob to turn without any visible fixings.Note: there is no return spring on this model. Please be sure that the lock mechanism contains a sprung return. Or alternatively tick box if a fitted concealed self-return spring required at additional £42.00.Priced individually (not pair).