This round doorbell with blind fixing in a nickel version has been brushed afterwards, giving it a matte appearance.
Intersteel Doorbell - Bell push around 0019.399027
With a doorbell you can hear when someone is at your door.
Doorbells are easy to mount on a door frame. Intersteel doorbells are suitable for a two-wire connection.
Consider the width of the frame before making a choice from the various bell pushes.