These Golden Angels are similar to the ones by Bernini:
Here is a picture of Michelangelo's Caliper:
These pictures are from the internet since in order to preserve the integrity of the relics visitors weren't allowed to take photos at the exhibit.
Vatican Splendors covered: Early Christian Dialogue between Faith and Art
The Rise of Christian Rome
The Early Renaissance
The Renaissance Basilica
Art in the Service of Faith
The Art of the Liturgy
Dialogue With the World
The Successors of Peter - Papal Portraiture
Art and the Contemporary Papacy
Catholicism in Western Pa.
I purchased a Vatican Splendors catalogue which consists of informational essays, commentary, and photographs so I will be posting a series on the individual objects in the exhibition as well as historical data from Church history.