Said to be Millers Falls, but I can't find it in any of my digital 
catalogues.

https://www.jimbodetools.com/collections/whats-new/products/millers-
falls-corner-brace-86101">https://www.jimbodetools.com/collections/whats-
new/products/millers-falls-corner-brace-86101

Can anyone shed light?

Don

-- 
“It is better to be killed by a woman with a knife than by a man with a gun.”
Che Guevara

A thermometer is not liberal or conservative. - Katharine Hayhoe

Of all the tyrannies that affect mankind, tyranny in religion is the worst.
Thomas Paine

Being offended doesn't make you right.