The open channel across most of the drill hole is for the creative beader! I hand cut this one of a kind, freeform shaped focal bead out of contemporary Fordite. Measurements are shown in the listing title. It is side drilled with a 2.5mm hole. CHAIN NOT INCLUDED. This Fordite is accumulated paint overspray from Ford Motor Company's Kansas City Assembly plant in Claycomo, Missouri. I just bought out the collection of the guy who was sourcing it for me. As his employment has changed he can't get it anymore. I've been cutting varieties of this for over 40 years. I can generally tell whether or not the material is genuine automotive Fordite. Contrary to what had been believed for many years about the unavailability of new rough due to manufacturing changes, there is SOME contemporary Fordite rough that is collected and made available to cutters. I have a good stock of rough to work with. Compare mine with other Fordite for sale on the internet! Much of it is fake and either "handmade" by just pouring pretty colors of paint together that are clearly not automotive paint colors of ANY era, or they're just stripey resin beads made in China and not real Fordite. I grew up in a rock club in Michigan during the 1970's and old, wise guy rock hounds who worked in the auto industry would collect chunks of dried, layered car paint from the paint sheds at least as early as the 1960's. The paint was built up overspray that had been baked repeatedly making it relatively hard and solid. It was sold at local rock and gem shows as "Fordite, Chryslerite, Buickite or Detroit Agate." Fordite was by far the most common and popular name and has come to be used for all industrial oversprays used in the jewelry trade. Those old rockhounds would never believe what has become of their novelty faux gemstone!