Always use these tightening keys to loosen or tighten ChiaoGoo’s Spin or Red cables to the interchangeable needle tips or connectors. Insert the tightening key inside the hole of the metal join and loosen or tighten the cable. If desired, use the keys in combination with ChiaoGoo’s heart-shaped, rubber grips to get a good grip. Available in two sizes: M for MINI cables and S-L for Small [S] and Large [L] cables.