Strong, flexible ropes lie flat without kinking or twisting - easy to store. Smooth joint - allows stitches to slide around the needles easily! The long screw in the “joint” ensures that the rope and needles stay connected while the tightening hole in the metal joint provides a more secure tightening. The specially designed “key” makes it easy to tighten and the tips fit easily onto the rope to hold the knit securely.