Our 9000 Series sliding patio doors are made with a steel reinforcement system and durable uPVC which won't corrode, rot or warp over time. Most importantly, the insulated warm edge CS Ultra Spacer ensures that your glass will stay clear, as well as add comfort to your home. Tempered glass on both panes is standard. Strong and durable, the 9000 Series Patio Doors glide easily over a stainless steel mono-rail track, while heavy duty zinc adjustable tandem roller provide a lifetime of effortless operation. Available in 2, 3 and 4 section configurations. Available in both custom and standard sizes.