Proprietary steel and heat treat process yields greater strength and longer bit life. Better and more consistent fit to fasteners leads to better torque transfer. Cutting edge machining process results in tighter tolerances and superior product consistency. Reduced diameter nose for limited clearance applications. - Apex Tool Group 440-TX Series Insert Bit, Length: 1 Inch, Shank Size: 0.25 Inch, Drive Size: 0.25 Inch, Material: Steel, Hex Drive, Tip Type: Torx®.