zangra says

This door handle in Limoges porcelain is entirely handcrafted. The production method used for manufacturing these door handles has remained unchanged for nearly a century.
Diameter: 5cm. Distance between the screws: 3,3cm. The quoted price is for a set of 2 door handles, i.e. for 1 door.
2 porcelain covers and the necessary screws are included.

The door spindle is 7 mm wide for France and 8 mm wide for Belgium and the Netherlands

Technical description