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  • Inverter ring with continuous M54 x 0,75 male thread
  • Converts an M54 x 0.75 female thread into an M54 x 0.75 male thread
  • Optical length equals to zero, disappears completely between two M54 x 0.75 internal threads and therefore cannot become jammed. As soon as the connection is opened, the external thread ring is also loose
  • Inside non-reflecting grooved and painted dead flat black