The MILWAUKEE® SHOCKWAVE™ Impact Duty™ Insert Magnetic Nut Drivers are engineered for extreme durability and up to 30x life. The insert magnetic bit tip holder is made from custom Alloy76™ steel, heat treated to control hardness. Milwaukee insert magnetic nut drivers feature powerful magnetic tips allowing for a secure grip and unyielding bit engagement. Each bit has color-coded rings for quick and easy size identification. The SHOCKWAVE™ Insert Magnetic Nut Drivers are designed for use with impact drivers and drill drivers for heavy-duty impact application.