Our 3/8" Drive Metric 6-Point Socket with FOUR FLAT™ Sides was designed from the ground up to be part of the most versatile socket family. MILWAUKEE® 3/8” drive sockets feature an innovative design with four parallel flat sides, which deter rolling and are wrench-compatible. The Metric socket sizes are stamped into the flats providing you with improved, easy-to-read visibility. These deep and standard socket sizes have optimized geometry to reduce bolt rounding and stripping. We back all our 3/8” drive Metric sockets with a lifetime guarantee. Our 3/8" Drive Metric Socket sizes range from 6mm to 19mm in standard and deep well sockets.