KIT ST-ER-Mini : The kits contains ER mini collet chuck with a cylindrical shank and a set of collets in various bore sizes.
  DesignationStockDCONMSCSIRange mmQtyGICATGIREMgiic
  KITST12X807ER11M N/A12.000ER11 0.5-7 74507055 0
  KITST12X8010ER16M N/A12.000ER16 0.5-10 104512020 0
  KITST16X507ER11MF N/A16.000ER11 0.5-7 74507056 0
  KITST16X1007ER11M N/A16.000ER11 0.5-7 74503032 0
  KITST16X1507ER11M N/A16.000ER11 0.5-7 74503033 0
  KITST20X10010ER16M N/A20.000ER16 0.5-10 104512021 0
  KITST20X15010ER16M N/A20.000ER16 0.5-10 104512022 0
  KITST20X10012ER20M N/A20.000ER20 1-12 124512023 0
  KITST20X15012ER20M N/A20.000ER20 1-12 124512024 0

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