For interior or exterior doors. Single or Double acting. Slide track design. Recommended for high traffic, heavy abuse installations. Durable slider cam and shock block. 1-3/4" minimum door thickness. 1-3/16" square channel. Complete screw packet for installation in wood and machine screws for door and frame. Door Opening Size (in inches) for Stop function Model Number 1-336: Butts/Offset Pivots: 33-1/16" - 38" Center Hung Pivots: 36-1/16" - 41" - ANSI/C01541