Bosch BlueGranite Turbo bits begin with the aggressive holds achieved with the PowerGrip shank. Steel teeth that extend from the shank are designed to catch between the jaws of power tool chucks. Bit is easy to chuck in the tool and won’t slip. 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.