When will you want this Adaptor? If you are installing a railing on a deck or porch with odd angles (like an octagon). The adaptor lets you install a horizontal railing section at a 22.5° angle.
The Adaptor is designed to work with Deckorators® ALX Classic or Estate rail kits that use 2.5-inch square posts. The Adaptor MUST be paired with the ALX Classic rail brackets (in-line or stair). The 2 pieces join to make the angle and then connect to the post.