The Milwaukee Shockwave Impact Duty Magnetic Nut Drivers are engineered with the most durable magnet to stand up to heavy-duty applications throughout the life of the nut driver. Themagnetic nut driver securely holds screws during application set-up providingunyielding bit engagement.Made from heat-treated custom Alloy76 steel to control hardnessforextendedbit life. The optimized Shock Wave absorbs peak torque and prevents bit breakage. Milwaukee magneticnutdrivers feature a chamfered edge for maximum screw-head engagement while theimprovedhex geometry allows for the best fit and reduced stripping during use. The nut drivers also featurecolor-coded bands that aid with selecting the right diameter. Designed for use with impact drivers and drill drivers.