Nut Driver Drill Bit Is Designed To Be Both Pivoting And Straight Models. The 20-Degree Pivot Mode Allows For Reaching Places Like Corners Or Narrow Locations High-Hardness Material: These Nut Driver Set Are Made Of Chrome Vanadium Steel With Corrosion Resistant Black Phosphate Coating, Which Have High Hardness And High Torque After Overall High-Temperature Quenching And Heat Treatment Quick Change: Universal 1/4'' Hex Shanks Fit Quick-Change And Lock Firmly In Standard Chucks, Designed For Impact Drivers And Wrenches Strong Magnetic Hold: Magnetic Core Design Reinforces A Secure Lock And Retention On Bits During Nuts And Bolts Fastener Application