Our Socket Adapters with FOUR FLAT™ Sides are designed from the ground up to be part of the most versatile socket family. Milwaukee™ adapters feature an innovative design with four parallel flat sides, which deter rolling and are wrench-compatible. The drive sizes are laser etched onto the adapter providing you with improved, easy-to-read visibility. Chrome plating offers corrosion and rust protection. All Milwaukee Mechanics Hand Tools are backed by a lifetime guarantee.