Specification: Diameter of Main Pole: 25MM Diameter of Secondary Pole: 20MM Overall Length: 152CM Max Bar Diameter Compatible: 21MM Windbreak Stretcher When using windbreaks, it tends to all go well for the first ten minuets, however, after that the fabric between each bar tends to sag. This is natural when the wind pushes and pulls the bars to become loose in their anchor points. The simple solution to this common issue is the Windbreak Tension Rod. Each end has open slots that a bar can rest into. With the bar horizontal simply place a vertical bar holding your Windbreak up into each end. Using the adjustable screw, you can set the specific length between the bars, this then creates a solid structure to prevent each bar from moving. In turn, this doesn't allow your windbreak to sag, so you can truly put up your feet and relax.