Our 4PC Replacement Bits include the Bit Sleeve & 1/4" Nut Driver, ECX™ #1 & #2, PH #2 & SL ¼”, PH #1 & SL 3/16”, and SQ #1 & #2. The driver bit set is compatible with the MILWAUKEE® multi-functional screwdrivers and offers you the most common bit sizes. These bits are double-sided for compact convenience with engraved markings for quick identification. This 4-piece bit set has a limited lifetime warranty.