Nothing holds tall doors more safely or securely than a three point locking system and this great new espagnolette system is no exception. Sturdy set also helps larger doors resist warping. It's handsome nickel finish resists corrosion and provides smooth working locking action. Turning the key moves the rod vertically, up and down engaging the stops mounted to the top and bottom of the case. Stops have built-in 4mm adjustablility. Supplied in an 82" height and cuttable to shorter lengths.