<ul><li>Your search for you forever hinge stops right here. This hinge is made of <strong>stainless steel</strong> and will last for many many years--unlike similar priced latches found on Amazon.com .</li><li>Self drilling screws provided. If you are going to install these on wood we suggest supplying your own wood screws.</li><li>Works on double door gates (two pairs required)</li><li>Minimum 1/2 gap is needed to mount. Works on both 5x5 and 4x4 posts.</li><li>Your gate upright should be 1 3/4" wide in order to install these without modifications.</li><li>There are several different ways these hinges can be installed depending on your needs. Search for a few videos online to see how to install.</li></ul>