Our 12pc 1/4" 3/8" and 1/2" 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.