AddiExpress Stopper Limiting Aids
Suitable for both the AddiExpress Professional & Kingsize Knitting Machines
You can use the stoppers to wind narrower panels and always end the row in the same position. This is particularly helpful if you want to create a nice uniform width to your work. The AddiStopper lets you set the width of your panels for a fast, clean finish. The set contains two stoppers.
There's a huge amount of content on Addi's website about all of the knitting machines.