Our Email List: Email Address: Metal Window Frame and Mullion Anchors Single and double anchors with straight or offset heads in accordance with American National Standards.... **Window Jambs, mullions, sills, etc. of aluminum, steel, or other materials vary in shape and design among fenestration manufacturers. These line drawings are symbolic. Weatherguard... service anchor systems are capable of interfacing with all window (wall) sections. Cleaning and servicing windows using a system of Window Cleaner Anchors is the least expensive...