The Eyebolt is a heavy-duty piece of hardware to anchor zip lines to posts.  When connecting your zip line to trees, a Cable Sling can be used, but for posts, the Eyebolt works great.

The threads extend part way down the shaft (the length of the threaded portion of the eyebolt  may differ from the picture).  All of our eyebolts are hot dipped galvanized to resist oxidation.

Not only do you get amazing hardware, but you get the very best customer service in all the land.

If you're not happy, send it back for a full refund within one year.