On Wed, 20 Jan 2016 11:15:16 +0000, The Natural Philosopher
wrote:

'spire clip', which is what they are generally called in the
engineering trade

Thank you for the replies. Does anyone know why they are called Spire
clips? Were they invented by a man or company called Spire?

Probably a daft question but is one finish better than another? Ebay
sellers seem to have black ones or zinc plated yellow ones. Is one
finish more durable, less likely to rust than the other?

Thanks,
Stephen.