the aluminum poles have two lengths: 1*2.44m+2*2.10 and 3*2.90m This solar roller is removable roller composed of stainless steel and aluminum tube. Use an elasticrope to connect a bubble cover and the roller. One end of elastic rope to insert into the grooves ofthe aluminum tubes and the other end to fix on the bubble cover. Turn the roller handle, and thecover will be rolled onto the aluminum ...