hi,
TVH number for the drill bit (called a "reamer") is 106TA8984. you can contact TVH at wwwDOTtvhDOTbe and you may find it worthwhile to look at their full line of battery servicing equipment if you are in the business of servicing batteries. don't forget personal protective equipment like neoprene gloves and apron, face shield, ventilation equipment and emergency shower and eyewash station to protect you from accidental contact with acid!