Charles Middleton explained :
Its the projecting type that I need - however how much "projection" can I
expect to get. I need probably around 6-8cm's.

Are there different sorts that give different amounts of projection?

The length of projection, so far as I am aware, is simply dependant on
the size of the rawlplug. For that length of projection the easy
solution is to buy the type of rawlbolt which takes a bolt (rather than
a stud type) and buy some screwed rod plus nuts to use instead of the
bolts.

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Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.org