This is Knobbles and Bobbles' pretty hearts ceramic knob, the diameter of this knob is 3.8cm and the bolt will fit through a door that is up to 2.5cm thick. We have longer bolts available for some of our designs, please see the Longer Bolts category on the menu to the left. Each knob is supplied with the ceramic head and metal fixings including bolts and washers. Any questions? Please ring us on 07746 357625.