ST - DOUBLE ENDED MINI COLLET CHUCK WITH A FLAT A ➚ A .00020 58-60 HRc Ra 4µin T T D1h6 D D d L Ref L1 L Ref Designation Range L1 L D1 D d T* Machine Type ST3/4X2.756 ER11 MF D .022-.278 2.756 .787 .750 .630 .295 .669 ** ST3/4X2.165 ER16 MF D .022-.396 2.165 1.024 .750 .866 .413 .669 ** ST1 X2.441 ER16 MF D .022-.396 2.441 1.102 1.000 .866 .413 .866 *** * Wrench size ** Citizen *** Manurhin 829