2.5 inside six angle wrench, why are some people called M3 wrench?
Inside the six angle cylindrical head screw M3, with six corners in its head, and the width of the opposite side of the hole is 2.5.
It's called "2.5 inner six angle spanner"". Because this wrench is the main parameter, "2.5"".The inner six angle wrench has standard GB/T 5356-2008.
That is to say, an inner six angle wrench with a width of 2.5 is suitable for tightening the inner six corners screw of M3.
