The TUSK Torsion Bit range are specifically designed for use in Impact Drivers. The tapered design is engineered to deliver more power and durability, with up to 5x more life than other standard bits. Made from proprietary heat treated steel with compression forged tips for more strength, making the head less prone to failure under high stress applications.
 
The taper allows the bit to twist and flex ever so slightly allowing the shaft to accept some of the back force instead of shearing under the enormous load that modern drills put out.