The IRWIN/HANSON impact fastener drive set includes 16 pieces specifically designed for use with impact tools, providing maximum power transfer and durability. The rugged construction of these fasteners withstands high torque, making them suitable for demanding jobs. Each piece is heat-treated to increase strength and extend tool life. The set features a hex shank that prevents slippage, ensuring effective and efficient fastening. Additionally, the set is stored in a compact case that keeps all bits organized and easily accessible, facilitating convenient use and storage.