The Makita T-01725 is a 70-Piece Bit Set. The Makita T-01725 70-piece drill and driver set is a great value -- more accessories, more savings. Every tool is black-oxide coated to resist corrosion, and given a proprietary heat treatment for sharper, longer lasting life. Manufactured with Ultra-Lok 1/4-inch hex shanks, the tools are compatible with all quick-change connector systems, electric or battery-powered drill/drivers, and impact drivers. The drill bits are manufactured using high-speed steel with precision 135-degree split-point tips to prevent drill bit walking. The pro-grade, maximum magnetic 3-inch bit holder and nut drivers provide extra-strong fastener retention.