KIT ST-ER :  The kits contains 1 ER collet chuck with a cylindrical shank and a set of collets in various bore sizes.  
 
 
Tooling kits & sets   RUNOUT (INTERNAL) 0.005  HARDNESS 46-48/58-60  SURFACE FINISH N5 
  Designation
SS
CSI		 d
Range
Qty
  KIT ST16X50 7 ER11 F  16  ER11  0.5-7  7
  KIT ST20X50 7 ER11 F  20  ER11  0.5-7  7
  KIT ST20X100 7 ER11  20  ER11  0.5-7  7
  KIT ST20X150 7 ER11  20  ER11  0.5-7  7
  KIT ST20X50 10 ER16 F  20  ER16  0.5-10  10
  KIT ST20X100 10 ER16  20  ER16  0.5-10  10
  KIT ST20X150 10 ER16  20  ER16  0.5-10  10
  KIT ST20X50 12 ER20 F  20  ER20  1.0-12  12
  KIT ST25X100 12 ER20  25  ER20  1.0-12  12
  KIT ST25X150 ER20  25  ER20  1.0-12  12

Each kit contains one collet chuck, a full set of ER collets and a wrench.
F suffix indicates a flat on the shank.
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