The molding is fastened to framing with screws and snap into place glazing system. The adjustable opening accommodates 1/4" or 1" inserts. The perimeter interior and exterior are neoprene glazing seals. The molding is silicone sealed at the base to the framing system. Daylight opening is 1" above mounting surface with a finish color to match the new framing system. Surface applied extruded aluminum glazing