Cut to very fine tolerances. But do be careful not to over-torque. I explain why you need kid-gloves for all hex keys less than 4 mm. Not much metal separating the small hex keys from a piece of wire.
Personally, I avoid ball-end style for 3 mm and smaller – even less metal. If the hex key does not strip, the cap screw will.
Here’s a link to the ASLT hex driver on aliexpress:
https://www.aliexpress.com/item/ASLT-4-in-1-Hex-Driver-Screw-Hexagon-Head-Screw-Tool-Set-for-RC-Helicopter-Car/1892556940.html?spm=2114.13010608.0.64.hV0TU0
Post time: Jul-15-2017