These arms are designed to work on Sturdy Stakes and Ultomato that is sold at The Home Depot.
You add a new stake arm to a new stake that join your existing three-stake setup so that you then have four stakes. Instead of a triangle shape, you then have a box shape. The more arms and stakes you add, the bigger your space becomes. You must add a stake or stakes, and add a stake arm or arms to grow the size of the tomato plant's holding support system. The stake arms themselves are solid and of fixed length. They are what they are. They expand only through a combination of more stakes and arms. Pulling on the arm will not produced a longer stake.