This Bosch Impact Driver Bit Set is best for use with all impact drivers and standard drill drivers, including high voltage impact drivers. Made from specially formulated V steel alloy, these extremely tough bits are perfect for heavy duty useage. Torsion control helps withstand the stress of high torque applications. For use with all impact drivers and standard drill drivers. Can be used with high voltage impact drivers. Made from specailly formulated V steel alloy. Highly durable. Perfect for heavy duty usage.