Impact-resistant solid vinyl frame and sash, fully welded, 2-1/4 in frame thickness. Double strength tempered glass for added safety and durability. Both sash operate and are removable. Fully weeped frame for efficient water removal. Pre-punched nailing fin for added ease of installation. 1 in J-channel siding return. Fully weather-stripped. True interlocking sash. Hook latch lock for positive sash to sash engagement. Includes full screen.