E 27 Lampholders are ES or Edison Screw lamp holders designed for 240 Volt application hardware for Australia (RCM), UK, Europe (CE) etc.
These are made of solid brass, ceramic or Bakelite material and have compliance to the following standards.
IEC 60238:2004+A1:2008+A2:2011
AS/NZS 60238:2007
AS/NZS 60238:2015 + A1