Dewalt 1in. Steel Torx Security Bit Set. DEWALT Max Fit Screw driving bits are the perfect way to maximize your DEWALT power tool system. Featuring the 10X Magnetic Screw Lock System the maximum fit bits are ideal for use in impact drivers and drill/drivers. Each bit features a precision-machined tip for ideal fit in screw head recesses, resulting in less stripped screws. The Magnetic Screw Lock System holders and sleeve feature a floating ring magnet for fastener retention. Optimized for exact fastener fitment to reduce cam-out. 1 in. bit tips. Heat treat maximizes torque 7-piece set. Full hex design increases bit tip strength. Includes T10, T15,T20,T25,T27,T30,T40.