Custom Alloy76 Steel is heat treated to extend bit life 100 Piece Screw Driver Drill Bit Set Impact Duty SHOCKWAVE Alloy Steel Wear Guard Tip Milwaukee SHOCKWAVE Impact Duty Screw Driver Bit Set, Alloy Steel Screw Drill Bits Sets 25 Piece Milwaukee Tools SHOCKWAVE Impact Duty™ Driver Bit Set - 100PC. The MILWAUKEE® SHOCKWAVE Impact Duty™ 100PC Driver Bit Set is engineered to be the Most Durable, Best Fitting driver bits on the market. The SHOCK ZONE™ is optimized for each tip type and length of driver bit in the set to absorb peak torque and prevent breaking Optimized Shockzone is unique per tip type and prevents breaking The Milwaukee Shockwave impact duty 100pc driver bit set is engineered to be the most durable, best fitting driver bits on the market. The wear guard tip delivers increased wear resistance which protects the impact bit's fit over the life of the bit Wear Guard Tip protects fit over bit life