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For tightening the join between your ChiaoGoo Mini Interchangeable Needles (Sizes 1.5mm - 2.5mm) and Mini Cables.
Insert the key into the lifeline hole on the metal joins at the ends of the cables and and use as a handle to grasp and screw the connection. It is recommended to do this every time you attach your tips to a cable to make sure that the join is secure.
Each pack contains 4 keys.