O C&F Design® Standard Gravity Kit CFT-67-S is for adding more weight to adjust tension to materials and hooks.
     FEATURES:
     -     Especially Magnum Gravity System helps tiers when large SW fly on the jaw of vise.
    -     It is just for bobbin holder from C&F DESIGN only.
    -      (NOTE: Our previous model which does not have hole on the arm cannot be installed.)