The one I use is this;
https://www.screwfix.com/p/wiha-vde-...1-pieces/2581k
The only problem is that you get more bits than you need, I later came across the same driver/setter but with less bits and not as expensive because of having less bits.
I also got this;
https://www.screwfix.com/p/wiha-soft...3-x-75mm/2678k
And this;
https://www.screwfix.com/p/wiha-soft...4-x-75mm/8624k
I needed these because the Wiha is a VDE instrument and the drive is not quite 1/4" for safety reasons.
Over the top? maybe so, but I like prescision and repeatability.
I settled on 1.6nm for the clamp bolts, and 1.0nm for the scope caps. This was equating to a tad under what I used with normal hex keys using the "tight with the short end plus 1/4 turn with the long end" method.