The MILWAUKEE 1/2" Drive 24MM Metric 6-Point Deep Well Socket with FOUR FLAT Sides was designed from the ground up to be part of the most versatile socket family. The 1/2" 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 improved, easy-to-read visibility. This deep well socket has been optimized geometry to reduce bolt rounding and stripping. Milwaukee backs their 1/2" Drive Metric Sockets with a lifetime guarantee. Milwaukee 1/2" Drive 24mm Deep 6-Point Chrome Socket 45-34-2124