Our SHOCKWAVE™ PH1/SL1-4 Impact Double Ended Bits are engineered to be the Most Durable, Best Fitting driver bits on the market. Each Double Ended Driver Bit features MILWAUKEE® Wear Guard Tip™ for increased wear resistance which protects the fit over the life of the bit. Milwaukee double ended bits have Shockzones™ optimized for each tip type and length to absorb peak torque and prevent breaking. Precise custom machined driver bit tips prevents stripping and reduces wobble giving you extreme durability for the most demanding applications. The PH1/SL1-4 impact double ended driver bit is made from Custom Alloy76™ Steel to extend the life of the driver bits, providing up to 50X life vs. competitive impact driver bits.