The 4PC MILWAUKEE SHOCKWAVE Impact Duty 1-7/8 Magnetic Nut Drivers are engineered for extreme durability and up to 30x life. The Milwaukee nut drivers are made from a proprietary steel, heat treated to control hardness and feature a strong magnetic tip for a secure grip and unyielding bit engagement. Each magnetic nut driver bit has a color coded ring for quick and easy identification on the jobsite. The SHOCKWAVE Impact Duty accessory line is designed for use with impact drivers and drill drivers and ideal for heavy-duty impact applications, while delivering a full system solution for all the user's drilling and fastening needs.Custom Alloy76 Steel is engineered to extend lifeStrong magnetic tip for fastener retentionColor-coded band for easy size identificationProvides up to 30X lifeDesigned for heavy-duty impact applicationsDesigned for use with Impact Drivers and Drill DriversIncludes: 1/4 in. , 5/16 in. , 3/8 in. , 7/16 in.