Hello, I am fixing a new timber garage door frame to a brick wall.

I have bought some hammer-in frame fixings - but how do you actually use
them?

The plastic sheath is 14cm long, 10mm in diameter,
with a lip of diameter 13.5mm. My timber is 7cm thick.

What's puzzling me is that the end of the sheath obviously grips the
brick, but what grips the wood?

I realise I'll need to drill a 10cm diameter hole in the brick.
But will I need to drill a 13cm diameter hole in the wood, or 10cm?
(Or a 10cm hole all the way through, but 13cm at the outside?)

Also how deep should the hole in the masonry be?

And when do I stop hammering and start screwing?

Thanks!
Dave