Tightening and loosening long bolts and studs is simple with Klein's 7-Piece 3" Nut Driver Set (631). This kit features the most frequently used nut drivers. Each one has a cushion grip handle for more comfortable use and greater torque. They also have full hollow shafts that are designed with Rare Earth magnetic tips to facilitate work on long bolt applications. Additionally, the internal flanges provide solid, twist-resistant shaft anchors.