This Bosch BlueGranite™ Turbo bit begins with aggressive hold achieved with the PowerGrip shank. Steel teeth extending from the shank are designed to catch between the jaws of power tool chucks. The bit is easy to chuck in the tool and designed to resist slipping. The tip of the BlueGranite Turbo bit is Bosch carbide, diamond ground for precise starts to avoid scratching and skating in tile and hard stone. Use on brick, block, ceramic tile, marble, wood, drywall, gypsum board, limestone, slate, plastics, sheet metal, and cast iron. Use with corded or cordless drills.