Milwaukee Shockwave Matrix Carbide 2.25" PH1 2 Pack (48-32-3911). Our Shockwave Matrix Carbide Impact Driver Bits have new-to-world innovation that solves your frustration of driver bit tips wearing out prematurely. The impact driver bits combine our optimized Shockzone technology with our new proprietary Matrix Carbide Steel to give this driver bit the ability to absorb the peak torques of impacts while also providing you with extreme wear resistance. This revolutionary advancement in impact driver bit technology is backed with a Lifetime Tip Warranty ensuring that you will continue to be able to drive fasteners long after all other impact bits have failed.