The MILWAUKEE 99-Piece SHOCKWAVE Impact Driver Bit Kit is engineered to be the most durable, best fitting driver bits on the market. The bits feature Wear Guard Tip for increased wear resistance which protects the fit over the life of the bit. The impact driver bits have an 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 Driver bits are built to deliver users extreme durability for the most demanding applications. This 99-piece kit includes a compact bit holder in addition to Phillips, Square, Slotted, Hex, and Torx bits for maximum jobsite productivity.