Tube to be used as an axis in a winding system for study funds. On the shaft is fixed the fabric bottom that will be wound on this same tube. It is supplied in 3 sections of 1m each which are joined by means of supplied connecting pieces, leaving a compact tube of 3m long. Outer diameter of the 48mm tube. This tube is fitted and fixed in the winding mechanisms, manual winding kits and motorized winding kitsados.