Bosch 3-Pack 1-7/8" Impact Tough Magnetic Nutsetter Set is a professional-grade tool designed to withstand the high torque of new impact drivers. It consists of 1/4", 5/16" & 3/8" nutsetters, each with a 10X life over standard impact bits. The X-Tended torsion zone helps to absorb high torque, while the advanced design provides a secure fit. The heat-treated manufacturing process ensures increased durability, and the high-visibility sleeve with laser-etched markings makes for easy identification.