• 21-piece driver bit set includes premium alloy steel bits for screw fastening and nut tightening
• Impact-rated alloy steel construction delivers superior strength and durability for high torque applications
• Precision machined tips engineered for secure fit in fasteners, reducing cam out and preventing rounding
• ProFlex torsion zone energy absorbing design to reduce stress, extending bit life and improving impact performance
• MODbox compatible storage case stacks and locks securely with other Klein Tools case sets for organized transport
• Enhanced magnetic bit holder maximizes magnet contact to securely retain fasteners
• Variety of Phillips, Slotted, Square, and TORX® bits to drive common fasteners on the job

Klein Tools 21-Piece Driver Bit Set features impact-rated alloy steel construction for superior strength and durability. Precision-machined tips ensure secure fastener fit while reducing cam-out. ProFlex torsion zone absorbs strain, extending bit life and improving impact performance. Klein Tools MODbox compatible case keeps bits organized and secure.