I bought a good set off Amazon that was aimed at setting torques on bicycles. I've added a few American sized hex drivers to the set since I got it. Very handy for working on my CZ 457 MTR.
https://www.amazon.co.uk/gp/product/B07JKJTDWC/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Lots of similar stuff on Amazon.
Regards
JCS