Pella 250 Series 59-1/2-in x 47-1/2-in x 3-1/4-in Jamb Left-operable Vinyl White Sliding Window Half Screen IncludedPella 250 Series vinyl sliding windows offer advanced security and privacy features. Featuring dual pane SunDefenseTM Low E insulating glass and Argon, they allow natural light while blocking the sun's heat, ensuring cooler summers and warmer winters. One sash glides horizontally while the other remains stationary. The vinyl material has been tested for fade resistance, durability, and color retention. A metal cam action lock ensures long lasting