• Reinforced for Quality - The sliding patio door vinyl sashes are reinforced with metal bars for added strength and durability. • The Strongest Vinyl Frames - Fusion-welded corners on both the frame and sash and a multiple hollow chamber design build strength and structural integrity directly into every patio door we manufacture. • Put Away the Paint for Good - Integral color throughout the vinyl creates a lasting finish that never needs painting. The vinyl in our sliding patio door will never chip, peel, or crack - guaranteed! • Energy Efficient - Our multiple hollow chamber design produces a thermally efficient frame with superior resistance to heat transfer. • Feel Safe and Secure - Our sliding patio door comes standard with a heavy-duty locking system that will make you feel safe and secure. • Easy Rolling - Adjustable all-metal tandem rollers running on a high-strength polycarbonate track ensure that these doors open and close easily and quietly. • Heavy-Duty Screen Door - Standard with our sliding patio door is a heavy-duty screen door with no-rust fiberglass mesh and adjustable rollers.