Features and Benefits:Wear Guard Tip™ protects fit over the life of the bit;Optimized Shockzone™ absorbs peak torque and prevents breaking;Custom Alloy76™ Steel is engineered to extend bit life;Precise Fit Custom Machined Tip prevents stripping and reduces wobble.;Shockzones™ are optimized in both length and width per tip type for best performance across tip types.;Laser hardening at the tip creates an outer protective shield for improved wear resistance.;Customized geometry and heat treatment per tip type for best performance across tip types;Up to 50X Life vs other impact bits;Laser etched size for easy identification;Designed for use with Impact Drivers and Drill Drivers;The MILWAUKEE® SHOCKWAVE™ 3-1/2" Phillips #1 Impact Duty™ Bit 2 Pack is 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 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.