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

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.