For fixing the screw connections between needle or end stopper and cable.

Insert the keys into the hole of the metal end piece of the cables, connectors and stoppers and use them to tighten the screw connection, please use these keys every time you tighten something.
For an even better connection, try using the heart-shaped rubber gripper wrapped around the tip with the key.
For loosening please use the key again.

only suitable for SMALL (S) and LARGE (L)

4 pieces