hardware such as a bolt 23 nut 24 or other fastener known to those of ordinary skill in the art thus the unitary hook reinforcing element 27 of the present invention is suitable as a retrofit device for existing patio door locks the unitary hook reinforcing element 27 of the present invention improves upon existing patio door locks by occupying a void 26 see fig3 in the lock hook mechanism housing 13 thus the strength of the sliding glass door assembly 10 is improved the lock hook 20 and reinforcing boot 30 may be made of plastic or metal material suitable for use in a sliding door border 12 plastic materials include but are not limited to fiberglass fiberglass reinforced nylon glass filled nylon glass filled polypropylene polyester and vinyl metal materials include but are not limited to steel titanium brass pewter aluminum or tin or any alloys thereof furthermore the metal material may be plated or coated to reduce its friction coefficient or to retard oxidation and corrosion substances suitable for this purpose include but are not limited to zinc brass bronze or chrome the lock hook mechanism housing 13 of the present invention is designed to pass a forced entry resistance test for locking mechanisms briefly the forced entry resistance test includes a five minute disassembly sequence a five minute tool manipulation sequence and a series of u201c pulls u201d to test the locking mechanism strength during the disassembly sequence.