The Mayhew Tools 8-pc Triple Square Bit Set, No. 16006, features a low-profile, dual drive design, ideal to use in tight spaces. The set can be driven by a ratchet, socket spinner, box, or open end wrench. It includes 4, 5, 6, 7, 8, 10, 12, and 14mm bits. The bits are titanium coated for wear resistance and rust prevention, and proprietary heat-treated for durability and strength. The bits are made in the U.S.A. from S2 tool steel. A convenient storage rail keeps all bits organized and easily accessible.