1-7/8 in THK aluminum frame. Overlapping frame seals out weather and conceals hinges and gaps. Double weather stripping for excellent protection. "Easy Vent" balanced window system for easy one-hand operation. Two closer system, bottom closer features " Hold Open" button that holds storm door open with tap of toe, top closer adds dependable opening and closing. Color-matched bottom expander adjusts to uneven sills. Designer screw covers conceal exterior mounting screws. "REVERSA-HINGE" for right or left mounts. Use "QUICKFIT" handle sets for these doors which are sold separately (sku #s 433.8752, 433.8794, 433.8828, 433.8844).