The MILWAUKEE® SHOCKWAVE™ 3-1/2 Torx 15 Impact Duty™ Bit 2 Pack is engineered to be the most durable, best fitting driver bits on the market. The torx 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 Duty™ driver bits are built to deliver extreme durability for the most demanding applications.