Built for heavy synching down of thread for deer hair and woolhead tying.The stainless steel tube on this 4″overall length model has a tapered tip to make it a convenient half hitch tool. The neck of the bobbin has 8 rubber o-rings which serve both as a gripping point and a thread holder. Instructions are included on the back of each package on how to remove end cap and set the tension for the thread being used. Item# 2311