This kind of adapter has a 3½"-8 external thread that allows to mounting metrology instruments, bases or other adapters. It is done with six mounting holes that allow to fixing the ring to any plane surface.
It is made to mating with any product having an 3½"-8 internal thread.
|External Thread||3 1/2''-8|
|Dimension||Ø 88,9 mm x h 13,8 mm|