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JIS screwdrivers, the now defunct Japanese Industrial Standard screw type, just different enough from phillips/pozidrive to make dismantling classic Japanese bikes a screw chewing nightmare.
I think the limit screws on Shimano derailleurs are JIS, not Phillips or Pozi. Or they were.
Although my bikes are in the garage, and it's cold so I'm not going to check. Have a feeling they've started coming with a flat slot as well. Aren't they an odd thread gauge as well?
Makita LXT everything, fab stuff for powertools.
For hand tools Facom is my favourite for sockets and allen keys.
Bahco sockets are good too (better than the Halfords stuff I also have).
I have some Stanley professional screwdrivers that are a joy to use.
The main thing I have found over the years is that there is a right tool for every job, and the difference between having the right tool and botching with the wrong tool is profound. That's my excuse for having more tools than many garages and I am sticking to it!
FACOM spanner’s, sockets and some nice 6 sided socket spanner’s. I’ve some snap on swan neck ring spanner’s as well which are brilliant for fiddly stuff (x trail anti roll bar bush clamp nuts....grrr).
Some metrinch sockets for use when stuff has rounded off.
The Park derailleur hanger tool is sweet
Best tool ever......Lidl £6 multi tool driver with some very small Torx bits for tiny torx bolts that are used by some manufacturers of Telecoms kit. It’s been a “life saver” at 3 am when a colleague calls me out as he cannot get the “sodding Allen bolts” undone on a failed card on some of the new kit we’ve got
For JIS screws I have a Vessel Megadora screwdriver which is excellent quality. JIS screwdrivers made by Hozan are also supposed to be good (I haven't tried them).
Last year Park Tool released their own JIS compatible screwdrivers: https://www.parktool.com/product/derailleur-screwdriver-dsd-2. A bit late to the party. I hope they're better quality than Park's standard screwdrivers, which are quite poor.
JIS screwdrivers made by Hozan are also supposed to be good
Thumbs up here for my Hozan, makes the job of adjusting mechs that bit smoother...
JIS screwdrivers, the now defunct Japanese Industrial Standard screw type,I believe still used in derraileur adjustment screws
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Got a stack of rubbish 27mm sockets at work, various sizes and origins. Land Rover, tractor and dumper wheels amongst other agri' stuff. Wheels rarely come off on the big stuff, so generally require an 8' bar and a combined 30 stone.
Re the JIS screws....
That explains so many chewed up screw heads over the years! 
Never heard of it before this thread!
Re JIS screwdrivers the model I have is the 'Vessel Megadora 900 Series JIS Cross point No 2 x 100mm' which fits the JIS screws used on bikes very nicely.
Hozan for the win!, this is a Hozan D-332 2-100, very secure fit in B-Tension screws as they seem to lock themselves in to the machine screw heads and also very handy for fettling Honda Ride-On lawnmowers/ motorbikes etc.....
Heh, my motorbike's carbs had JIS screws. Really soft JIS screws. I always assumed it was Mikuni's revenge for Hiroshima.
Nah, they were invented for the benefit of Japanese/Honda technicians
Customer : "dunno what's wrong with it?, it just started playing up for no reason whatsoever"
Honda technician : "you've been **** about with this again haven't you"
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