Diameter : 55 mm or 2,2 inches
Weight : 68 grams
Metal : bronze
Pope Pius XI (Italian: Pio XI); 1857 – 1939), was the Bishop of Rome and supreme pontiff of the Catholic Church from 6 February 1922 to 10 February 1939. He also became the first sovereign of the Vatican City State upon its creation as an independent state on 11 February 1929. He remained head of the Catholic Church until his death in February 1939. His papal motto was "Pax Christi in Regno Christi", translated as "The Peace of Christ in the Reign of Christ".
A Holy Door (Latin: Porta Sancta) is traditionally an entrance portal located within the Papal major basilicas in Rome. The doors are normally sealed by mortar and cement from the inside so that they cannot be opened. They are ceremoniously opened during Jubilee years designated by the Pope, for pilgrims who enter through those doors may piously gain the plenary indulgences attached with the Jubilee year celebrations.