Here is a new product we invented in response to a growing concern for improving the security of existing steel security storm doors. It is the first and only product that allows the homeowner to dramatically improve the security of their existing door without the need to remove the door. It is compatible with virtually all manufacturer doors which include the Marks mortise lock or similar. The handmade device is fabricated from rustproof stainless steel and can be painted in any of 10 standard color choices. It is one of the least expensive and most effective ways to upgrade your security storm door. Patents pending. See more at http://www.lockarmor.com