Glass: Toughed Low-E hollow (Several types of glass for choice) Track: Aluminum track Lock: Zinc alloy Life Span: 5-15years Incorporates finest storm door features:1) Retractable screen2) Deep exterior moulding profile3) Nickel plated lockset with matching sweep4) Integrated keyed deadbolt5) Four heavy duty hinges6) 1-7/8in.thick with steel core7) Vinyl maintenance free exterior8) Welded Corners9 ...