Our Metric 3/8" Drive 10-Piece Deep Well Socket Set features 6-point sockets with FOUR FLAT™ sides. This innovative design has four parallel flat sides, which deter rolling and are wrench-compatible. The socket sizes are laser engraved into the flats, giving you improved visibility. These deep well sockets have optimized geometry to reduce bolt rounding and stripping. The MILWAUKEE® 10 piece socket set is stored on a socket rail for tool organization and is backed with a lifetime guarantee.