7-Section aluminum tubes According to the size of the swimming pool,the length of the aluminum tube can be adjusted.Ideal for 3.8ft to 18ft swimming pool. 18Ft Pool Cover Reel Set The pool cover reel set is made of stainless steel and aluminum tubes.The length can be adjusted ,so that it is suitable for swimming pools of different sizes.It can cover your pool and keep debris from falling in your pool.This pool cover reel set protects the cover from damage and make your pool clean.Using the pool cover reel,the pool cover can be easily folded and stored,and the large pedals and sturdy hand cranks make your operation more convenient. Warmth Easy to assemble Easy to remove Wheel with handle The wheel with handle are smoother and more effective in use.Save time and effort. Flexible grooved design The grooved design allows you adjust strap as your pleasure, which make the assemble process easier. Anti-rust aluminum tube The aluminum tube includ two thin tube A and one thick tube B.Assemble them could be very easy. High quality materail makes it no casy to rust.