The Metric 3/8″ Drive 10-Piece Socket Set feature 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 stamped into the flats, giving you improved visibility. These metric 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.