Century Drill and Tool 68460 Premium S2 Steel Hex Key Insert Screwdriving Bit, 5/32-Inch Screwdriving bits made from premium S2 steel for long tool life while driving common or mild steel screws or case hardened screws Fits multiple tip hand drivers and 1/4-Inch hex holders for power driving applications always use a bit holder for power driving applications 1-Inch overall length