What is the size of the back screws on Huawei Watch W1 Active?

I followed up the guide for the Huawei Watch Jewel battery replacement and it says that the screws in the back side are T3 Torx. I don't know if this is different depending on the watch model, but I tried with this size and the holes seem to be smaller than a T3.

I can't find any information on the Internet about the size of the screws in this watch apart from IFixit and I don't have smaller screwdrivers to test.

Could someone tells me what is the correct screwdriver for this watch, so I can buy the appropriate one?

Huawei Watch Active on Amazon