1. shape slot and supporting the use of the difference, ER collet with ER shank nut use, SK collet with SK shank nut use.
      

    2. the difference between models, specifications and clamping range of the difference between the ER system collets are divided into: ER8, ER11, ER16,            ER20, ER25, ER32, ER40, ER50 eight models SK collets are divided into: SK06, SK10, SK16, SK20, SK25 five types of models.

    3.the difference in price, the SK cartridge than the ER cartridge price is a little higher. er cartridge of the overall dosage than the SK cartridge to be larger.