This Milwaukee SHOCKWAVE Magnetic Bit Holder is designed for use with impact drivers and features a strong magnetic tip for a secure grip. It is constructed from custom-engineered steel with heat treatment to provide maximum strength and flexibility. The optimised SHOCK ZONEâ„¢ technology absorbs up to three times more torque, offering enhanced resistance to shock from impacting. It has a 1/4? Hex reception and is suitable for high torque and impact applications.