Spring clips ??

[CAL]

Hi, can anyone help ? What are these clips called ?
I'm going to use them for a telescopic pole. Drill two holes and they push down inside the tubing and pop out to lock tubing together.
Just can't find out what they're called. Looked under tube fittings etc on Tinternet but no joy. Perhaps someone has any ideas ?

 

[n brown]

as everybody knows-'pole retaining snap button spring clips '- just rolls off the tongue don't it though ?

https://www.google.co.uk/search?q=t...NT-POLE-AWNING-PADDLE-%2F161277633813;299;300

 

[CAL]

as everybody knows-'pole retaining snap button spring clips '- just rolls off the tongue don't it though ?

https://www.google.co.uk/search?q=t...NT-POLE-AWNING-PADDLE-%2F161277633813;299;300

Many thanks Mr Brown. It was on the tip of my tongue (not) Tried everything but.
Will order soon when exact pole dimensions are worked out. Cheers.