The Klein Tools 64-Piece Micro-Ratchet Precision Driver Set and 40-Piece Impact Driver Bit Set Bundle provides professionals and DIYers with an extensive assortment of driver bits and nut drivers for diverse applications. The precision driver set features a micro-ratchet and magnetic adjustable bit driver to maximize access in tight spaces. It includes 33 precision bits, 16 standard bits, 11 nut drivers, a bit holder, and cushion-grip handle conveniently housed in a compact modular case. Complementing this, the impact driver bit set is built with torsion zone technology to absorb impact forces and extend bit life. It contains 40 durable S2 steel bits, including Phillips, slotted, square, TORX, and nut driver bits. The set also includes a strong magnetic bit extension and nut drivers to securely grip bits and fasteners. The bits and extension fit neatly into an impact-resistant modular case. With over 100 premium driver bits and nut drivers, this bundle combines Klein's innovative precision and impact-rated tools for driving and fastening applications. The modular cases stack together for organized storage and transport.