On 12/08/2019 20:15, wrote:
On Monday, 12 August 2019 14:15:18 UTC+1, Jim GM4DHJ ... wrote:
turns out it is for fixing to a single paten box to give you a double socket
.......

Those are quite expensive usually, if you actually want one.

Owain


double socket converter £4.30

https://www.toolstation.com/socket-converter/p88126