This is Knobbles and Bobbles' classic blue melon shaped ceramic knob, the diameter of this knob is 4.0cm and the bolt will fit through a door that is up to 2.5cm thick.
Longer bolts are available from the top menu under All Knobs -> Fittings and Longer Bolts.
Each knob is supplied with the ceramic head and metal fixings including bolts and washers.
Any questions? Please ring us on 07746 357625 or email email@example.com.