Hi Kim, These attach to the ChiaoGoo Spin cables located here: https://www.handsomefibers.com/ChiaoGoo-SPIN-S-and-L-Interchangeable-Cables_p_117.html The hooks will spin with these cables. The cables themselves spin at the join. Size I (5.5 mm) and larger hooks will fit the [S] cables with the use of an L to S adapter (sold separately). Thank you for asking. Tracy, Handsome Fibers.