3cm (with reducing ring or 4cm without).
Shade Carrier 5"Adapter Lamp Support Metal Frame For Floor Lamps Table Lamp NEW
Pewter shade carrier 5” gimble/gimbal /lampshade holder for table/floor lamp
Lamp Shade Carrier Frame Adapter 7'' Wire Support UK/EU Floor Table Lamp ES, BC
Lamp Shade Carrier Support Gimble Frame For European 42mm Lamp Holder
Table Lamp Shade Carrier
