The MILWAUKEE® SHOCKWAVE™ Impact Duty Magnetic Nut Drivers are engineered with the Most Durable Magnet to withstand heavy-duty applications throughout the life of the nut driver. The magnetic nut driver securely holds screws during application set-up providing unyielding bit engagement. Made from heat-treated CUSTOM ALLOY76™ steel to control hardness for extended bit life. The optimized SHOCK ZONE™ absorbs peak torque and prevents bit breakage. Milwaukee's magnetic nut drivers feature a chamfered edge for maximum screw-head engagement while the improved hex geometry allows for the best fit and reduced stripping during use. The nut drivers also feature color-coded bands that aid with selecting the right diameter. Designed for use with bit holders in impact drivers and drill drivers.