Vega T165T20T25BT Impactech T20 + T25 Double End Power Drive Bit feature a patented spiral torsion zone that absorbs impact resulting in longer tool life. Vega T165T20T25BT Impactech T20 + T25 Double End Power Drive Bit precision engineered tips are manufactured with a proprietary CNC machining process and are made from S2 Modified impact resistant steel. Vega T165T20T25BT Impactech T20 + T25 Double End Power Drive Bit are tested to outperform all leading brands in life cycle and tip failure testing.