This is from the CRK website:
There is an extra hole on the Sebenza handle. What is it used for?
This is a tooling or locating hole and, in the finished knife, has no real function. The process goes something like this: we buy titanium in sheet form and cut it into rectangles approximately the size of the handle. We drill all the holes into this rectangle which is then placed onto a fixture, held secure by locating pins through these holes. The profile of the handle is then machined and the rectangle begins to look like the handle of a folding knife. It is at this stage that we select left or right-handed knives. One hole becomes part of the pivot assembly while the other is left vacant. Sometimes, however, we use the hole as part of the graphic on the decorated models and, on occasion, enlarge the hole and inlay a cabochon or coin into it.