From the selection of tools they have left on my aircraft they seem to prefer multi headed screw drivers that you can get from petrol stations.
Then it would seem that tradition dictates that they take the heads that are most use and throw them in the bucket. This then leads them to always use one which is either to big or too small for the screw and thus strips the head.
The bring out of the wire lock whizzy thing is always something to be looked forward to. Plenty of swearing and sucking fingers is bound to follow.
I am a pilot not an engineer but experence has shown me this is common through most of europe.