12mm max.

Wall box
Code: 9-1820
Berker wall box / contact protection box, 45mm diameter
Wall box
Code: 9-1820-01
Berker 45mm diameter wall box / contact protection box
Wall box
Code: 9-1883
Berker wall box / contact protection box, 49mm diameter
Wall box
Code: 9-1915-02
Berker Wall box / Contact protection box, 2 gang, 49mm diameter