The Griptorq Diamond Tile Drill is vacumm brazed with a 10mm segment. The Griptorq Diamond Tile Drill is wax filled therefore no water is required when drilling the toughest man made and natural materials. The wax filled core melts during use which lubricates and cools when drilling. The The Griptorq Diamond Tile Drill has a Hex shank for use in cordless drills.