The Milwaukee 50 piece Drill and Driver set is engineered to offer you the most durable, best fitting driver bits on the market. The Wear Guard Tip delivers increased wear resistance which protects the impact bits fit over the life of the bit. The Shock Zone is optimized for each tip type and length of driver bit in the set to absorb peak torque and prevent breaking. The driver bits are made from Custom Alloy76 steel and a proprietary heat treatment process to extend bit life, providing up to 50X life versus other impact driver bits on the market. The Milwaukee Shockwave Impact Duty driver bits are built to provide users with extreme durability for the most demanding applications.