external diameter: Ф102mM
spherical diameter: SФ75.5mm
There is a middle hole and There are 24 holes in the internal circle of holes of which the included angle is 30°. There are 96 holes in the external circle of holes of which the included angle is 15°. 121 holes in total.
The hole diameter: Ф0.5mm
It is made of brass.
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