KIT ST-ER : The kits contains 1 ER collet chuck with a cylindrical shank and a set of collets in various bore sizes.
  DesignationStockDCONMSCSIRange mmQtyGICATGIREMgiic
  KITST16X507ER11F N/A16.000ER11 0.5-7 74509020 0
  KITST20X1007ER11 N/A20.000ER11 0.5-7 74503026 0
  KITST20X1507ER11 N/A20.000ER11 0.5-7 74503027 0
  KITST20X5010ER16F N/A20.000ER16 0.5-10 104512025 0
  KITST20X10010ER16 N/A20.000ER16 0.5-10 104512026 0
  KITST20X15010ER16 N/A20.000ER16 0.5-10 104512027 0
  KITST20X5012ER20F N/A20.000ER20 1-12 124512028 0
  KITST25X10012ER20 N/A25.000ER20 1-12 124512029 0

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