3/8" Drive 21mm Deep Socket

Features and Benefits: ?FOUR FLAT Sides deter rolling ?Wrench-ready FOUR FLAT sides ?Stamped Sizes for Better Visibility ?Chrome Finish ?Optimized Geometry to prevent rounding ?6 Point Socket ?Corrosion Resistant ?Deep Well Depth Socket ?Lifetime Guarantee Our 3/8" Drive 6-Point Sockets with FOUR FLAT Sides are designed from the ground up to be part of the most versatile socket family. MILWAUKEE sockets feature an innovative design with four parallel flat sides, which deter rolling and are wrench-compatible. The 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 sockets with a lifetime guarantee.