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 ZONE 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.