Our SHOCKWAVE� Impact Duty� Phillips Bits are engineered to be the Most Durable, Best Fitting driver bits on the market. The Phillips bits feature Wear Guard Tip� for increased wear resistance which protects the fit over the life of the bit. The impact driver bits have and optimized Shockzone� for each tip type and length of driver bit to absorb peak torque and prevent breaking. The Custom Alloy76� Steel is customized and heat treated per tip type to extend the life of the driver but by up to 50X vs. competitive impact driver bits. The MILWAUKEE� SHOCKWAVE� Impact Duty� driver bits are built to deliver extreme durability for the most demanding applications.