Neilsen 39pc Impact Screwdriver Bit Set PH PZ SL Torx 1/4" Drive Socket Bits Ideal for both professional and D.I.Y use Works with all drill/drivers,quick-change connectors and impact drivers Material: All Bits=S2; Magnetic Nut setter=CRV; Hex to square=CRV Black oxide finish resists corrosion and extends tool life High quality S2 steel for maximum durability Torsion I-beam magnetic bit holder is 2X stronger than standard bit holders - absorbs impact shock and extends driver bit life Extra-strength magnetic nut drivers provide strong fastener retention 1/4 inch hex shank stops drill chuck spin-out Includes the most popular screwdriver and nut driver sizes Works with all drill/drivers, quick-change connectors and impact drivers Content: 24pcs S2 DRIVE BITS, 1''- 2pcs