The DEWALT 21-Piece Max Fit screw driving and Gold Ferrous drilling set features innovative screw driving and drilling products to maximize your DEWALT power tool system. Featuring the 10X Magnetic Screw Lock System, the Max Fit bits are ideal for use in impact drivers and drill/drivers. The Magnetic Screw Lock System sleeve features a floating ring magnet for fastener retention. All drill bits feature a tapered web design, providing greater durability to reduce breaking.