The Milwaukee® 1/4 in drive 5/16 in SAE 6-point deep socket was designed from the ground to be part of the most versatile socket family. The innovative socket design has four parallel flat sides, which deter rolling and are wrench compatible. Socket sizes are stamped into the flats for improved easy-to-read visibility. Optimized socket geometry helps reduce bolt rounding and stripping. Milwaukee® 45-34-9005 Socket, 1/4 in, 5/16 in Standard Socket, 6 Points