Milwaukee 5PK 1” Insert Nut Drivers are built to deliver exceptional durability and performance for heavy-duty applications. These SHOCKWAVE Impact Duty™ Magnetic Nut Drivers feature the most durable magnet, ensuring screws are securely held during use for reliable bit engagement. Crafted from heat-treated CUSTOM ALLOY76™ steel, they extended bit life with superior hardness control. The innovative SHOCK ZONE™ technology absorbs peak torque to prevent bit breakage, while the chamfered edge design maximizes screw-head engagement. Improved hex geometry provides fit and reduces stripping, making these nut drivers highly efficient. Color-coded bands make it easy to select the correct diameter, and they are designed for use with bit holders in impact drivers and drill drivers. Model Number: 49-66-4563