The Milwaukee 12pc 1/4 in., 3/8 in., and 1/2 in. drive external torx socket set with FOUR FLAT sides is designed from the ground up to be part of the most versatile socket family. Milwaukee E-Torx sockets feature an innovative design with four parallel flat sides, which deter rolling and are wrench-compatible. The laser-engraved size markings provide easy identification, and chrome plating offers rust and corrosion protection. This set includes a storage rail for better organization. All Milwaukee sockets are backed by a Lifetime Guarantee.