Diamond drill bits from Glastar make holes in glass fast. Great for glass block crafts, drilling holes in wine bottles, openings for clockworks, jewelry and other projects where glass drilling is necessary. They work with any electric drill and only need water as a lubricant. Each bit drills hundreds of holes. Made with a patented diamond bonding process for extra long life. 3/8".
Pro Tip: There is a learning curve for using this product. Please drill a couple of practice holes in a glass bottle before drilling into something that's important to you.