Impact resistant solid vinyl frame and sash, fully welded, 2-14 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 finfor added ease of installation 1 J-channel siding return Fully weather-stripped True interlocking sash Hook latch lock for positive sash to sash engagement Includes full screen Size In=36 x 36