addi® Click
The addi® Click interchangeable circular needle system provides various sizes of addi Turbo®, addi Turbo® Lace, addi® Natura, and addi® Hook tips! The Click tips require no tools to change; simply insert the cord deep into the tip, twist and release.

Addi® Click instructions can be downloaded here
  addi® Click Sets
The addi® Click system provides 8 to 10 different sizes of addi®tips as well as interchangeable cord lengths for the perfect set of knitting needles!
  addi® Click Hooks
The addi® Click Hook set features 8 addi Click crochet hooks in a travel pouch.
  addi® Click Tips
Add an extra set of tips to your addi® Click kit!
The HeartStopper end-caps quickly and easily click onto the end of all addi Click cables!
  addi® Click Cords and Connectors
Add an extra set of cords or connectors to your Click kit!