I have a super long drill bit! Believe me that bit got hot! You could feel the heat through the wood as i drilled. The bit is at least 12" long. It is wired, I photoshopped the cord out of it. The light inside is LED, so never should need changing, but as you see from the photo of the back, you can simply unscrew it and change it out. The wood was absolutely amazing, but seemed like it needed something to push it over the “top” and get more money for the charity. Thanks for your question!

Ellen