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.;Up to 50X Life vs other impact bits;Laser hardening at the tip creates an outer protective shield for improved wear resistance.;Shockzones are optimized in both length and width per tip type for best performance across tip types.;Customized geometry and heat treatment per tip type for best performance across tip types;Laser etched size for easy identification;Designed for use with Impact Drivers and Drill Drivers;The MILWAUKEE SHOCKWAVE 3-1/2" Square 2 Impact Duty Bit 2 Pack is engineered to be the most durable, best fitting driver bits on the market. The square 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.