Knobs - Shell Petal Knobs - Shell Petal Knobs - Shell Petal €4.25 Quantity: at €4.25 each Add To Basket 1 in stock. 0 in your basket View Basket Checkout Add a touch of glamour to your furniture with these gold rimmed 5 pointed petal knobs. The diameter of these knobs are 4cm and the bolt will fit through a door that is up to 3cm thick. Protrusion is 2.2cm from the base. Each knob is supplied with the knob, washer and nut.